Reviews mean a lot actually. Especially with 10 different reviewers (as in 10 different gaming-related companies) all rating something (in this case Saints Row) with a high score of 9 - 9.5 That should tell you this game might just be pretty good. I'm not saying to rely on reviews, but they're good to check as a starter before buying. Not just games either. You can/will find reviews on just about every product out there.
Saints Row is a great game. It's GTA on the next gen with many fixes and addons that the gta games lacked. One thing Saints Row offers that makes it addicting is the great controls. Not only does this game look amazing but the controls are almost (dare I say) perfect. This includes driving and on foot and both driving and on foot combat. I've just turned off the xbox360 after playing about 5 hours straight.
If you were into the GTA games then you would be a fool to not get this game. At least rent it, or download the demo. It speaks for itself really.
I give it a 9.5 out of 10. I would give it a full 10, however there are a few bugs. Don't worry though, the bugs are minior but you'll still notice them (AI related)