I deleted it after finally finsihing the campaign, I din't hate it. At that time, at least last year, it had co-op? just not split screen. If I can convince any of the kids to start a chronological playthrough I'll replay, otherwise never again like with 5. I did 4 twice.
CE through Reach were all Half Life 1/2 and Doom 1/2 levels of replayed (8+ times each easy). I don't know how to articulate what went wrong. They are not bad games.
But our time is finite. Work/family/survival take up most of and I don't want to spend more than a little time in your game unless it's 10/10. I know thats a lot of preasure but thats facts.