As I had mentioned earlier in the aforementioned forum (refer to OP), simply utilizing ones skill cannot be considered illegitimate and cannot result in a ban or "kicking", regardless of the ire it may cause. Having said that however, players should only play against other players equal to their own skill level.
The Halo 4 battle mentioned earlier was a fair and simple Grifball match, with neither team being intrinsically handicapped. Your Black OPS II example refers to one player dominating, however, this may only be due to one of two reasons:
1) The game is unbalanced, in that it has lower leveled new players battle against experienced veterans.
2) The other players have not gained as much skill and experience despite being at an equal or similar level to the veteran.
Neither of these reasons are grounds for "kicking", much less a ban. A proper skilled player shall never enter a lower level battle due to the inevitable boredom, and thus, banning resulting from great prowess is immoral.
TL;DR : It is immoral to ban a player due to skill level.
The Halo 4 battle mentioned earlier was a fair and simple Grifball match, with neither team being intrinsically handicapped. Your Black OPS II example refers to one player dominating, however, this may only be due to one of two reasons:
1) The game is unbalanced, in that it has lower leveled new players battle against experienced veterans.
2) The other players have not gained as much skill and experience despite being at an equal or similar level to the veteran.
Neither of these reasons are grounds for "kicking", much less a ban. A proper skilled player shall never enter a lower level battle due to the inevitable boredom, and thus, banning resulting from great prowess is immoral.
TL;DR : It is immoral to ban a player due to skill level.