Yeah I couldn't get through the first episode either. The animation looked decent, but the rest just felt like generic action cartoon stuff.
I also don't see the point in using the team from the movie if you're just going to give them a bunch of generic cartoon personalities. I would have loved to have seen Ruffalo's more bemused and low-key Banner in this, or Evan's and Hemsworth much more human and likeable Cap and Thor. Hell, even Renner's grittier Hawkeye would have been kind of fun to see in a cartoon.