I agree, the Coliseum is not fun to play, I personally leveled up Luke to 7 star and level 25--and decided no more money on this. The battle itself is just a beat down by the boss toon(s). The new characters look cool, but the battle is boring and there is no strategy or skill involved at all.
The lagging in game like Territory War and GAC? Completely awful. I'm losing matches I've never lost before because of timeouts. It's beyond annoying. Relic delta was a bad idea too.
CG needs to issue a major apology and make this right!