Yeah I got the pre-sale pack for the team ups, but I'm pretty disappointed with em as they are currently. Pretty much all I do is cosmics, so with the long ass cooldown and how fast they die, passive mode is really only thing they are good for, which is pretty lame for something called a team up. I don't know why they aren't just immortal when set to the 30 second summon mode, it's not like they are gonna solo a cosmic boss for you or anything.
I'm hoping they do some major tuning on them, but seems most of their manpower is always working on new stuff, and the few folks doing balancing on older content/heroes are pretty behind. If you notice, except for the reworks there is basically zero tuning on released heroes outside of major bugs, even though many powers could use their numbers tweaked.