you see mag is much more realistic(besides from weapon damage). cod is just run around kill people w/e. mag is more than just deathmatch its a full scale war and mag adds more aspects to the gameplay then any other game i know of. whether its being a merdic healing people, repairing bunkers etc being a squad or platoon leader choosing how to destroy your enemy as in what to take out first AA or bunkers. in mag theres just so much more to do and thats why i love it.
now the downside. as you mentioned it doesnt always flow to smoothely but i find it quite smooth. also it takes more skill to kill someone not like cod 2 shots from a smg at 100 yards and your dead, you got to give em a few shots. i think it makes it more chalenging and fun, but not noob friendly
overall i like mag much better than an cod so far