Ahh, deathball was the best. I was disappointed to not see Vanquish there (forgot his name). Bayonetta was there so why not him?!
Do you think Kamiya has regret that he took Nintendo's cash to develop exclusives on a dead platform? I still might pick up a copy day one for the sake of supporting our lord and saviour kamiya. Then I'll play it in 2014 when the wii u drops.
I wouldn't say he regrets it: http://www.neogaf.com/forum/showthread.php?t=664593
The game is amazing. If you enjoy this kind of game you will probably enjoy it a lot. Combat becomes awesome after you get the hang of it.