No I don't agree it is overall better. There are pros and cons as I see it.
The main pro is the lack of "I've been here forever and ever and who are you to disagree with me?" sentiment, which was so prevalent before, even among some posters who had not been here as long as others.
And I agree that I did hate the way certain posters would pile in and come to the aid of other posters, seemingly regardless of whatever topic or opinion was being discussed.
The main con though is that many of those self-same posters would pile in to comment knowledgeably and wittily, and, on the occasions when they chatted to me, it could be very agreeable. That doesn't happen as often now.
Plus, I felt people knew me then, but most don't know me now. That's fine - nice to meet new people and all that - but it is also nice to feel known.
So all in all, no Mumsnet is not a whole lot better, just better in parts and definitely worse in others.