I love my Odyssey 2! I just played Frogger and Q-Bert. Frogger is incredibly difficult on this . When the frog gets run over, it's kinda gross. The splat is a little more graphic than on the Atari 2600, IMO.
I'd highly recommend Monkeyshines. The tag games can be confusing in a good way.
Have you tried "KC's Crazy Chase" ?? That's another outstanding game. it's like a combo between Centipede and Pac-man.
Do get "Quest for the Rings". The whole concept of combining a board game and a video game is very cool, especially in the 1980's. This game actually won an award.
Don't be discouraged by bad reviews you may hear. It just means that there will be more games out there for us O2 fans! LOL