Its much less complex than say, Wildstar. It SHOULD be less complex than Guild Wars 2 - except people long ago figured out how to 'gimp / cheat' that game and the devs never fixed it (Guild Wars 2's combat engine can, on all but a few select fights, be ignored by simply having a group all stack in one spot in a corner to prevent any knockbacks: once you do that, you can AOE down anything, and self heals end up outpacing damage).

However the game is more to similarly complex compared to other MMOs. I'm on the fence on this. The telegraph system here adds a lot less complexity than it should because the global cooldown is so amazingly long here, that for any event you have an absurdly long amount of time to react. You can go off, watch some Netflix, make toast and jam, and then come back and crawl your toon out of the way... Enemy mobs in this game complete their college degrees in between the long time between player attacks...

And for most fights that I have thus far seen in this game, dancing with the telegraphs and keeping off debuffs is pretty much the gimmick. That is not too different from Wildstar - but Wildstar has almost everything on a fast to no cooldown, no targeting by either players or mobs, all actions even heals are AOE... and telegraphs are short and varied in shape (in Wildstar I've had entire Tibetan Monk dioramas appear under my feet with less than a second to find the tiny gap between curves and criss-crossing lines that is the 'no insta wipe' spot).

The reals question is not is the game complex enough - but is it engaging enough to keep one entertained...

I'm finding it engaging right now.