I think there's a big difference between speculating on the property market and buying a place that you love, to live in.
In my experience/opinion, it's nearly always a good idea to get on the property ladder and buy your own place, as long as (a) you can afford a repayment mortgage and have a little bit of cushion in case the rates go up again, (b) you are planning to stay there for a few years at least, and (c) you are buying a property that is likely to be reasonably appealing to similar people when you sell.
Negative equity is only actually an issue when you come to sell. In the meantime, every month you are effectively enlarging your deposit by paying your mortgage back so your 5% will quickly become more.
You're right that rates are high now but over the course of any mortgage rates will go up and down, no matter where you started. But in the end you generally come out better:
With both my 1st and 2nd properties, I bought when prices were fairly high and during the 7 years or so that I owned each the value of the property didn't increase massively (say 10%) - but my equity went up hugely because of the repayments, so each time I sold I had a much bigger deposit for the next place.
Do your due diligence and check that there hasn't been a massive unjustified rise in prices where you are buying, or that you're not buying a very unusual property that might be harder to resell - but I think that in most popular areas with decent schools/commuting etc, prices are unlikely to go down much as homes will continue to be in demand.