I hadn't seen a recent glut of negativity towards Australia (was it on here and if so, can you link threads?). I would be interested to read.
I am half Australian half British and have lived nearly twenty years in the UK and Australia so feel I have a pretty good grasp of the positives and challenges. I know you've asked for positives, and there are many, but in interest of balance thought I'd write my thoughts in full.
Doctors
I really agree with other posts about the ease in booking to see a GP. It's great to choose your own GP practice, you can have more than one place and most places allow you to log on to a dedicated site and book an appointment within a day. Many times you can do so up to 8pm and on the weekend (depending on the practice). What I would say however, is that depending on where you live, seeing a doctor, even with a medicare rebate, can be minimum $40 each visit. More if you slip into a 'double appointment'. We live in a semi-rural location and there are only private GPs here so we think pretty hard if we do actually need to see a doctor. Although I did find it sometimes challenging to make an appointment to see a doctor in the UK, I never had to worry about if I had the money to do so. Operations in hospital can come with a bill attached. Doctors are good in both places.
Weather
The weather is 'better' in Australia, if you enjoy sun and heat for most the year (place dependent). It's usually easier to plan outdoor activities, BBQ, park play-dates, kids parties etc. However on balance, I prefer the UK weather. I know friends in their early 30's who have had skin cancer surgeries, it's not just an 'older person' disease. The UV here is fierce and not to be played with. I used to walk and explore almost every weekend, in almost any weather in the UK. Here, I either go out before 730am or after 440pm to escape the high UV which is extreme here every day for months. I slather on 30 plus suncream every day, even in winter and working in an office all day. We have beautiful beaches, but personally I don't swim anymore. The UV bothers me too much and my mind turns to thoughts of shark attacks over the past few years. Yes they are still rare, but they're there. I love the seasons you experience in the UK - the blossoms, autumnal leaves. I adore the snow. I even like rain, given I've experienced droughts before where you have to save shower (etc) water if you don't want brown dead veggie patches and flower beds. "Better" weather is definitely an individual opinion.
People
I find Australia people to be very friendly. If they like you, they like you. I've seen many occasions where strangers put themselves in danger to help others in need. Like a basic instinct. I've also seen this in the UK but I see it more here. Maybe there are more incidences, I don't know! I really dislike how Americanized Australia has become (intended). What's with all the bleached blonde heavily made up news reporters and why do we need to have adverts telling us all about their families and how much of a family person this reporter happens to be? Just read the news please and don't forget to touch on global information! (ABC/SBS an exception).
I also find financial competitiveness fierce and "keeping up with Jones's" an epidemic. This does exist in the UK, of course, but to my own personal experience, not on the same level. Australians can be direct, which can be a good thing however, the conversations asking about salary, house costs, savings and superannuation can be tiresome. I find it an unattractive trait, and uncomfortable chat. Why do you need to know? No-one raises an eyebrow, it's peppered in normal small talk. I didn't find this kind of directness about money in the UK. Perhaps the questions were more subtle or maybe many don't care. Most people I came across in the UK were friendly too, but more aloof at the start. Take more time to warm up to you. All depends on where you are in the UK. I find I had more deeper conversations and friendships with people living in Britain. Kids seem to be kids longer here in Australia. I can't explain it and don't know the reason behind it, but it's really apparent.
Money/workplace
We definitely, without a shadow of a doubt earn much more in Australia. Approximately 2.5x. I have not found most items to be 2.5x more expensive here. It is not like for like. Clothing, cars and food can be expensive but we have savings here that we never achieved in the UK. I know the 2.5x is not the same for many. I've see many occurrences in different workplaces here where colleagues make it look like they're really busy and can be quick to make a song and a dance about their workload, but somehow find ways to pass off their work to someone else or not complete things on time, in full. Of course this exists in the UK, but I have just seen more occurrences in Australia. I have the opinion that it almost doesn't matter what school you went to in Australia or how little money you had growing up - if you're good at what you do and have ambition and dedication you have good chances of rising to the top (if that is your wish). I'm sure there will be cases in the UK where really poor lower class end up leading companies, but I don't know of any (perhaps my ignorance and I'm sure I'll be told pretty quickly there are examples!)
Food
Oh, this is a big difference. You're hard pressed to find bad food here where it can be more hit and miss in the UK, especially when you travel to more rural locations. We have found fantastic restaurants here, even four hours drive away from capital cities. Fresh local ingredients, inventive menus and mostly, on balance, excellent customer service. You pay A LOT more for food in Australia, especially when eating out. I don't think the prices you pay are justified to be honest but then again, I have never run a restaurant and I'm sure the staffing and overheads are extortionate. Love the Asian influence here, but enjoyed the curries more in the UK.
There's loads more but this post was longer than originally intended!
All the above are personal experiences. I haven't met everyone in the UK, nor in Australia so undoubtedly there are examples of the 'opposite' of what I have written above.