I personally like GTAIV a lot more. GTAIV is my favorite game and I am a Rockstar fan.
I dont like the handling of Just Cause 2. Those who liked Saints Row 2 a lot more than GTAIV should better buy Just Cause 2 (but be careful it does not run under windows xp).
But if you going to buy it, play the demo first. And play it more than one time. In my opinion Just Cause 2 gets boring really fast. I dont like the handling. I dont like the animations how you and other persons move. And the driving of vehicles feels horrible for me.
You got some funny things like the ninja robe and unlimmited chutes you allways got. But they get boring after some time. The landscapes are nice but that`s it.
The story is bullshit, badder than a c-movie.
The stories of Liberty City are great funny and cool stories in the GTAIV world. They are not as serious as GTAIV was, but for many ppl they are more fun.
If you really like GTA clones like Saints Row or Crackdown you should buy it. But if you prefer the real feeling, buy the episodes for GTAIV!
http://www.gamerankings.com/ps3/933036-grand-theft-auto-iv/index.htmlhttp://www.gamerankings.com/ps3/943499-just-cause-2/index.html