Enjoying MW3 at the moment — although I haven't played it by myself yet (I only really enjoyed competitive games with a group).
However I have noticed SBMM is really off the boil. One minute you're being slaughtered by monster snorting try-hards, and next you're the one doing the slaughtering, thinking you might actually be alright at the game 🤣.
The only thing I've found to still enjoy the sweat-fest games is to hyper play the objective and try to just have a laugh.