I haven't played the later entries after MW2 due to the numerous things that turned me off on that one. But CoD4 had folks running the AK-47 most of the time, and that was a late-game unlock. The thing is, if you killed a person you could pick it up. So, I mean like Battlefield and other unlock titles, you're not
stopped from being able to pick up those guns and test them yourself if you kill the person. And you should be able to do that as even with no accessories on the guns, they'll be rock solid for starting players.
Titanfall has a huge skill discrepancy issue that unlocks won't solve. If you're matchmade with someone that is going into the out-of-bounds on top of the map to flank you and shoot you from above, there's not much you can do beyond trying to copy that (and probably failing). So his "this game is good for non-multiplayer people" is just

to me.