PS2 to PC emu for popular games does work?

Hi, i realise i do not know what i am talking about so please, no need to point that out to me.

I know there is no completed full working PS2 to PC emu that can enable you to play all games perfectly.

However, i have heard that for very popular games on PS2, people have managed to make a very accurate emu for that game alone.

Is this true? and if so, how long until gta: sa ought to have the same thing?

Thanks alot.

No posting iso/warez links thx

No PS2 emu for windows works great yet and not at a speed to be fully playable.