I've not seen it yet, but it's definitely on my list of "shows I should watch eventually." Man of Action's output outside of Ben 10 has been... mixed, to say the least, but I've liked the clips I've seen of Prime.
Admittedly I didn't watch much of alien force or ultimate alien.... Or read any of the comics they've released. I remember liking Generator Rex, but it was never on, so I couldn't say if it was actually good
I saw the first season when it first released and I'm generally enjoying it.
I get it's a kids show and Sonic stories are loosely connected, but I'm finding Sonic himself being too...reckless and unexperienced for where he should be. Like it felt like it took way too long for him to realize it's a multiverse situation and couldn't just snap Nine into remembering him.