Yep Unreal came out 6 months before Halflife yet has better graphics and is a longer game. Everyone raves about the opening to halflife but Unreal wasn't half bad, great interactive introduction on Vortex Rikers, hearing somebody getting destroyed behind a door, reading the diaries, then level 2 stepping out into a MASSIVE open world (by 1998 FPS standards), then level 3 the unforgettable "corridor lights" set piece where you fight your first Skaarj.
IMO Deus Ex and Far Cry are both better than Halflife, although as a series HL is hard to match.