I've been in MK for over a decade now, and I've been assimilated! It's green, it's friendly, it is still reasonably cheap in comparison to everywhere else that is 35 minutes by train from central London.
MK has a bit of a Millwall thing going - no-one likes us, we don't care - because we all know that when we tell someone where we live it will all be about roundabouts and concrete cows. There's a bit in Good Omens which refers to Milton Keynes with the following footnote, which just about sums it up:
"Note for Americans and other aliens: Milton Keynes is a new city
approximately halfway between London and Birmingham. It was built to be
modern, efficient, healthy, and, all in all, a pleasant place to live.
Many Britons find this amusing."
I work for the OU which is a community in itself, but I think it has a good community spirit in general. I can't pretend it has everything I wish for in a place - I love live music, but go to London for that, and the only good pubs require driving, which render them pointless. No matter, I am 10 minutes from the station so my "local" is actually in picturesque Berkhamsted. Plus because I don't pay London or Berkhamsted house prices, I can actually afford to go out still, unlike my friends with London mortgages who sit in watching telly eating beans every night.
But I have an ace house - it is in one of several enclaves built for exhibitions, so has all kinds of interesting architecture. I am 5 minutes from ancient woodlands. I can cycle the 7 miles to work almost entirely through the beautiful linear parks - or drive there in 15 minutes because the maligned roundabouts don't half keep the traffic flowing. Yes, the chainstores and chain restaurants dominate for the casual visitor, but there are hidden gems everywhere if you don't just whizz through on the roundabouts with an attitude.