I think the MP is fine, it just hasn't changed a whole lot, it simply isn't my goto mp shooter. The campaign was a snoozer in 4 and still is in 5, split screen made the campaigns for me in Halo 1 and 2, so that isn't much of a surprise. Halo solo has this innate ability to make me fall asleep these days (FWIW, so does Mario Kart, both solo and multi).