The game does EXACTLY what you tell it to do, for better or worse.
Disc golf:
This is a pretty good game of disc golf, but don't expect the variety of a Tiger Woods game; there aren't that many holes, as there are several other sports represented in the game. The game isn't very forgiving in when you release the disc during a throw. If you release it just a bit before or after you would in real life, the game will give you an equal representation of what would happen if you really did that. It's not anywhere near as forgiving as the disc golf in Tiger Woods Wii.
Bocce:
I honestly didn't know what bocce was before I got this game. Short explanation: first player throws a marker ball, and then the players take turns to see who can throw a ball (under-handed) and make it land (with roll) closest to the marker ball. The physics seem true, and there are a ton of different courses to play, from traditional to crazy. This I think is the best one for multiplayer.
Archery:
Archery is kind of silly unless you have two Move controllers, but with two it's a ton of fun. Just make sure you take the game's advice and don't hold the controllers too high; your arms will get tired and you'll be fishing around with your aim.
Volleyball:
I haven't spent a lot of time with volleyball, but what I've done has been pretty nice. It's not that the game is poorly executed, I'm just not a huge fan of volleyball the sport.
Gladiator Duel:
I've definitely spent the most time with this game. YOU MUST buy two motion controllers just for this game alone. One is your sword and the other your shield. The movement on the screen is 1:1. Damage is location specific and velocity determines damage taken. It is freaking amazing. I have spent way too much time playing it, and my sore sword arm can attest to that.
Table Tennis:
This is probably my second favorite sport on the disc. The first time you turn it on and see the paddle moving on the screen 1:1 with your controller it's hard not to be amazed. You can put spin on the ball, change angles, velocity, etc. It's really cool.
All in all, I think this has become my favorite PS3 game to be honest. Not only that, but all of my brothers and friends like to play it too. I definitely recommend it.
And to think I almost got the single controllers instead of the bundle!!