Why not? GTA III / VC and San Andreas had much improved graphics over the PS2 versions.
The only difference I noticed in S.A was the improved resolution (and I think the draw distance was better), didn't notice any other major improvements (can't remember the difference in vice city ps/pc gfx), I hope they fix the texture and appearing scenery issues that plagued vice city & sa too. But as long as it's as fun as S.A, it'll be a winner.
I wouldn't expect to see much of an improvement aside from draw distance and resolution; the textures may be slightly improved, but they didn't make use of the larger capacity Blu-ray discs on the PS3 so I wouldn't expect a huge change. Even with these small changes, the game should look fantastic on the PC with the higher resolution.
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