By today's standards it's not the best game ever but I still love it and it has it's appeal to me. For the time it could very much have been one of the best games ever made. I must mention I bought it brand new when it came out ten years ago. Well, my mum did, but that's not the point.
The HD port would make up for the time, though. If done right, that is. Well... I don't seem to remember anything Rockstar has done that would've disappointed me.