I think people develop an opinion of the UK after they've spent some time in another country.
For example, I went to Iceland in April and Malta last summer, and I said both times that I'd rather live there than in the UK. Mainly because I had such good fun there, but also because I compared loads of things to similar stuff in the UK. General attitudes of the people is one thing- people in Malta and Iceland are so friendly.
As it stands, I don't want to live in the UK in future because I don't like it. I like the fact that people abroad are so much nicer and their countries aren't always holding some sort of stupid inquiry into who hacked whos phone.
It's hard to explain. I don't like the fact that the police are so weak and criminals get short sentences for horrific crimes. Bring back police brutality or something, people literally get away with murder. Some guy I know was mugged last night, whereas in other countries, Iceland for example, that sort of thing is unheard of because it's the most peaceful nation in the world.
Don't even get me started on the government. Give Heathrow a third runway already and have done with it. (I'm ranting now.)