No, I've been enjoying them too. I was just a little annoyed at the start at how the gang seemed to take being launched into space, without being asked, as no big deal (particularly after all the sinister buildup from the Dome crew). Also, they really haven't made use of Eileen at all.
But as you said, it's still enjoyably fun and goofy, with a little refresher of putting Pops at the front. I'm excited to see it all wrap up, although I do hope they get back to that plot line of Mordecai and Rigby wanting to move on.
Have Watched all seasons with my boys age 7 and 8. None of us can be bothered to watch anymore of the last season. I think we've seen about 3 episodes and they are pretty bad. It just doesnt work in space all the time, it was pushing it having them confined in the dome. The odd really out there episode used to be ok but not changing the entire setup for full seasons. Seems they've forgotten what made this show great unfortunately.