The twitch factor is starting to concern me. Watched a friend play at low levels as long as you pay attention and have half a brain it isn't so bad.
My concern is that "hardcore" or endgame will be balanced against how quick your 4th grader Mario brothers reflexes are. Again using Tera as an example, there was nothing hardcore about their hardcore dungeons. Pretty much they up the speed of bosses' main combos and finishers as well as spam aoe telegraphs. If that's their version of end game and raiding, I'll pass. Enough you're already paying attention to ability spam and cool downs to also be concerned about missing the precise jumping and dodging sequence (double jumping in this case). Bet anything that double jumping is part of boss fighting mechanics.Boss has an aoe that deals a lot of damage nearly killing you, right before he does this a series of floating rocks bounce up and you have to jump, and then double jump onto them to avoid the aoe down below. Yes Nintendo Wii style.
If I want that sort of gimmick I'll stick to one of the numerous FPS mmos coming out on the horizon. They need to leave this twitch shit to the FPS mmos, they do it better and are typically optimized for it.