For me, the first game I ever played was T/FPS tank based shooter Recoil. And I would be amazed if there is another Escapist out here who has played it.
Despite dodgy graphics, a daft story and a sometimes buggy sequences, this game was actually good fun. Enough variety in weapons, enemies, levels and objectives to make the game interesting. Multiplayer was annoying but not terrible.
Still, don't bother getting Recoil. It's developers were bought out years ago, and I doubt there are any copies left (except the one in my home).
But way back when, I liked it.