Yea level doesn't mean much because it's just dependant on playstyle. I was level 58 on PS4 and 20 on PC, and I still didn't know shit, my map knowledge was terrible, I didn't know any callouts, I would reinforce and cave myself inside a room as I didn't understand the concept of rotation etc etc, I'd even reinforce the walls between bombs. I didn't even used to use claymores.
Then I started fresh on Xbox One with my friends and by level 30 or so I was doing wobbling (while peeking), opening up alternate pathways for quicker rotation and access to objective. And depending on the location of object I might not even reinforce anything (Kids bedroom in house for example). Granted I already had 58 levels on PS4 and 20 on PC, but before playing with a team on Xbox One I was completely reliant on my shooting ability and even there I had the disadvantage because I wasn't utilising my tools right.
Just the other day I came across a level 113 on Xbox and the dude was reinforcing walls between objectives, floor hatches on the objective floor (which you can use for rotation and attackers can never use to enter into the room) and just overall being shit.