People were generally down on Darkspore's non-gameplay teaser-trailer for the perhaps understandable reason that it's a franchise-expansion with a silly name to a poorly received game and all we really saw was a big old goopy-dude. I suspect the following combat trailer will give people a much better handle on Darkspore. At the least it says the magic phrase "4-player Co-op" which is hard to argue against. GO TRAILER!
Stuff like the morphing from one attack form to the other reminds me both of Evolva and the plans for Irrational's The Lost, where you were meant to skip between different sorts of avatar depending on what you were up to (basically creating the "multiple routes" approach).