Not OP but I have tried it and it really doesn’t age well. The story is novel for its time and I think it’s still alright but the level design absolutely didn’t especially when you put it beside games like Half Life that came out at about the same time. The maze in The Library was especially awful. Frankly, to me, the Xen levels in Half Life was better and that’s saying something.

Frankly, the only Halo games I ever had fun was Reach and Infinite even though Infinite’s story was eh… The gameplay was the most fun I’ve had in any Halo game.