I totaly love this game, best GTA so far without a doubt.
There are however things that still bother me, things that always been issues in GTA games.
One being how cars and people dissapear when they get out of sight. Things just vanish that should still be there. I understand this is probably due to a RAM issue, but I wish it kept things a bit longer even when you moved out of screen from them.
It's pretty silly when you follow some Grouppe6 van for example, and you crash somewhere and loose sight of them and suddenly it's gone eventhough it could only be there.
The Cop AI is pretty bad still, as someone mentioned, if I shoot someone out in the woods, with a silencer, and noone is close, my wanted level should not go up.
Another pretty silly thing about cops is when my stars finally are removed and I show myself by running to the nearby cops looking for me I'm suddenly not suspicious at all.
Way too few accessable buildings. Even GTA3: SA had more. I wish atleast all the companies that are on the stock markets were accessable buildings so you had a more direct approach to affect the stock markets.
I feel there are some missed opertunities by not having malls, theaters and so on. Especially when the online mode hits you could have some pretty amazing shootouts at places like that.
But overall its a great game. I hope it's expanded upon in the online version, making more interiors in buildings etc.