I don't know how people can think that taking up 4 slots in a 10v10 is Bad. In 5v5, we take up 80% of the team!

With coordinated efforts from Both sides, a 10v10 with a 4 Boxer will not be any worse off than an arena with 4 boxer.

Now, when it comes to multiple boxers, yes, I can see how more than one 4-5 boxer in a 10v10, or 15v15 would be pretty harsh, since it really cuts down on the ground your team can cover. But a single 4-5 boxer on a team can definitely be a good tool to the team's toolbox, especially as an assassin of Flag carriers.