DRAGONS LAIR - This game was a hit in the arcades but at home you'll probably only play it twice at the most.
ROAD RASH - This is probably the best 3D Road Rash, even though most of the models are actually 2D sprites!
ESCAPE FROM MONSTER MANOR - I wouldn't normally recommend fps for the 3DO.
GEX - This is a decent platformer indeed. But the PS/Saturn version was superior thanks to the extra voice acting (afaik).
PANZER GENERAL - It's a turn-based strategy game. Twas decent back in the day but I could not recommend it.
WING COMMANDER III Heart of the Tiger (4 disk) - A half-decent space sim with too much FMV. I prefer WC Prophecy but WCIII is similar
IMMERCENARY - Another tedious fps title that had the obligatory FMV bits
THE NEED FOR SPEED - Only tried the PC version. Not bad at all.
VR STALKER - Never tried/heard of this one
REAL PINBALL - Ditto
TEMPEST 2000 - I'm pretty positive the 3DO never had a port of Tempest 2000
DOOM - The 3DO port was just awful
PUTT PUTT Joins the Parade - Never tried/heard of this one
WOLFENSTEIN 3D - Pretty old and outdated
SHOCK WAVE - The sequel was much better
TOTAL ECLIPSE - Not a bad space sim but overshadowed by WCIII back in 1995
SAMPLER CD - No info
If you wish to get him more games, refer to this
earlier discussion.