Super Wing Commander was never released to any other consoles except 3DO and it's very good. It's a remake of Wing Commander 1 essentially with better graphics, sounds, etc. I think it may have come out to the PC & Mac too, but I don't recall.
Most of the games I would look at were mentioned already, but you can get others like Lost Eden, Shockwave series, Crash N Burn (I liked it at least), Samurai Shodown, a nice version of Flashback, Return Fire.
Here are some pretty crappy, but not the crappiest games: Guardian War, VR Stalker, Flying Nightmares, Starfighter, Lucienne's Quest (the only FF type RPG release in the US).
There are adventure / FMV games too like Night Trap, Sherlock Holmes, Dragon Lore, Strahl if you are into that
There are a lot of unique games for the system that were not released to any other system or PC, which can be both good and bad
I have a very extensive 3DO collection, and from time to time I might load up some crap game just because I'm bored. Overall, I like the system because it's just so out of place among the other consoles, and secondly it has a fairly large library eventhough it was not popular for the most part. Also, I owned one right when it came out and at the time I had a SNES too, but it was very impressive to load up Crash N Burn when there was nothing really comparable to it at the time.