As I said in another thread, this game is amazing.
The engine is stunning. The whole game is not even 5GB. There are huge variations in scenery and there are lots of communities and many different NPCs. You get a huge beautiful world to do as you please in. Hopefully the next GTA is a mix between the freedom of JC2 and the extremeness of SR2. Having said that, JC2 is also pretty over the top. It makes you feel like a badass.
Just finished the main missions yesterday (also done plenty of side missions) and I'm only at 22%.
I recommend downloading
this triggered explosions mod and using the Air Explosion. Much better than the normal one and it isn't too overpowered/underpowered.
I also downloaded the
less psychic police,
no black market cutscenes and
longer grappling hook. The longer grappling hook is kinda glitchy (sometimes you get two temporary hooks with one being useless) but it's well worth it. It also makes it more powerful which is pretty awesome. Oh and I also got
HD clouds.
I love how easy it is to install mods and how you can easily remove them.