The thing about 3DO is, the licensing fees were cheap and thus alot of stuff was slapped together and sold as games (like Plumbers don't wear ties). A few Notable 3DO titles are GEX (available on PS1), Street Fighter 2 (Almost Arcade Perfect), Road Rash, Need for Speed (X-man goodness), Samurai Showdown, Captain Quazar (sh'mup), Myst, Out of this world (This should be at the top of your list, its Amazing), Return Fire, Star Wars: Rebel Assault, Way of the Warrior (A mediocre fighter, but it was made by Naughty Dog, so there is some history there). Wing Commander III, Hell.
Ok there are alot more then I thought. A good thing about 3DO is you can run...backups natively without mods, so you can...borrow a game and see if you like it, then buy it.