Beat it and enjoyed it but probably couldn't go back and play it again. Most of the game is spent grinding and navigating maps that are too large and confusing.
Controls are not so good, and there are very few levels. The game gets extremely repetitive by the end. However, since it's a Katamari game it's still quite fun.
It's not very good... The weapon balancing is really counterintuitive, the units are not that interesting, the maps are bland, and the story is laughably bad.
It's just a good game. Characters are interesting and maps are fun. I don't know if the story is any good since I'm skipping all the cutscenes but that bit's not important anyways.