The original Halo felt quite clunky at times, and the level design in some areas was really bad, asking you to walk through very similar looking areas a lot. Halo 2 was the game that really made me feel like I was experiencing a journey unfold, the first game to make me feel like I was getting the Halo experience. The game still frustratred me a fair bit here and there, but I think I'll look back on it fondly.