Ok, I had Saints Row 2 for the PC, and had some thoughts (before I un-installed it)
The good:
1. I like the graphics of Saints Row 1, and 2. Clean, kind of antispetic looking, but detailed enough.
2. Character creator is nigh-insane.
3. I love the voice acting of Saints Row 1 and 2. Neil Patrick Harris, Jay Mohr, Keith David, Michael Rappaport, etc. Everyone is "cool" in my book. Especially compared to GTA: San Andreas's voice acting.
4. Decent mission selection, and diverse side activities.
5. I like some of the characters. Johnny Gat among them.
6. I like the GPS crap.
The Bad:
1. The PC version was fairly busted. It wasn't super unplayable, but would lag heavily. Granted, this isn't the most powerful PC ever, but I've read enough stuff (including GS's review) to know even on much more powerful machines, the game is still broken.
2. I really don't like aiming. 360 aiming is good. But I want a lock-on function, like GTA had.
3. The city is kind of confusing at times.
4. The big one: I don't like being required to do BS "respect" missions in order to get through the story. That's what caused me to stop playing Saints Row 1. It would've caused me to stop playing SR 2, but I got a trainer and just gave myself infinite respect, so it didn't matter. It's good to have the options to do mini-missions (mayhem, racing, escorting, etc.), but having them be required to get through the story is insane.
5. The game is kind of shallow. There's a bunch of stuff to do, but a lot of it feels hollow. I'm not sure why.
Anyways, I un-installed it, mainly due to the game dropping to a speedt 5 fps during a mission, and me failing to complete it, due to this fact. It's probably better on consoles, but I dunno, I really want to like Saints Row, but I just don't. And I loved GTA: Vice City, and San Andreas. I'm not really sure what the problem is.