CTF works a little differently than traditional CTF. There's two artifacts (flags) which need to both be held by a team in their base for 45 or 60 seconds for a victory.
While the artifacts are still going back and forth, it's enjoyably chaotic but it can be difficult to prevent a win if the flagholders really turtle up though that's a pretty common theme with CTF in most games.
Capture Point mode is fun in its own right but I feel like it's not was well balanced with the presence of runes (substantial individual power buffs) and the capture of all 3 points preventing the other team from respawning, it feels like a pre-emptive death knell for the losing team.
Arena is the real meat of the game, and I think it's extremely well done. There's nothing but your team, the other team, and the map which I think it's just as it should be. There can be a slight issue of balance when a team fields multiple of the same character but it's far from insurmountable.
There's enough characters for a huge variety of team comps but not so many that any characters fall by the wayside. They're all viable and valuable (though some definitely have higher skill caps) as long as you play to their strengths and use all their abilities; be they for control, healing, soaking, initiating, damage, peeling, etc.
All in all I think it's one of the best game platforms to allow skill to shine but on that same note I don't see it 'making it' because so many people will be put off by it's supposed lack of 'depth'. People just love big numbers too much.