HELL FUCKING YES!!
I love Rockstar, really I do <3 I've played GTA4 on an almost daily basis, and its never gotten old for me. The sweet physics engine, car damage models, smart ragdolls, hyper realism, unpredictability... its a game I could play to death and leave it for a month and it'll be cool all over again.
And now their newest, big project is Red Dead Redemption, an open world game using the same graphics engine and physics system as GTA4, only beefed up and with a nice Wild West skin put over it. Hell, GTA4 with horses would appease me! Looking so forward to it.