I like the bits of the States I've been to, although I've really only done the sides/bottom and not the middle, and have lived in Manhattan for a while and visit a couple of times a year since I lived there! I think it's as unfair to say "I like/dislike the States" as much as "I like/don't like Europe" - it may be one country but so different depending on where you go. Anyway, the bits I've been to generally get my ^ for the following (I agree with most of vinyl slider's points).
1. No language barriers (well, limited anyway!).
2. Fair exchange rate at the moment - good purchasing power, with lots opportunities to empty your wallet!
3. Manhattan specific but it just works - there can be a snowfall that would make London grind to a halt for a week but within 12 hours they are back to pretty much normal.
4. A lot of variety in close proximity (we've done a few driving holidays that have combined National Parks and big cities).
5. Cheap-ish petrol (helps with 4!).

There are some things that I find irksome, the tipping culture, the fact that sales tax isn't included, ESTA, but I love it as a holiday destination.