I dont know why people hate vista so much, I prefer it over XP.
Some people say its a resource hog. Well, it was when it came out, when "high end" system had maybe 2g of ram, laptops are coming with 4g now.
Also there are a few main things which are resource intesive,but can all be turned off, Aero for one and also the disk indexing.
Personaly the advantages of vista far outweighed the disadvantages.
1) Instant searches
2) Aero Looks realy pretty
3) Doesn't slow over time like XP does
4) Have you ever seen Crysis in dx9 vs dx10? Better yet, have you played Crysis in DX10 it runs a whole lot smoother and the physics work like a dream in dx10
But now that my rant is done the vista haters will continue to hate because they dont want to learn anything new.