Yeah, after the last arc (which was a long story following up on the entirety of the series thus far and the CHINATOWN graphic novel), I think Powell is telling some one-off stories for a bit.
I love this book and Powell is definitely at the top of his game. I'm actually surprised it doesn't have more pulls. Do alot of people read this in trades or is it just not-popular with this board's users/people in general?
I think Thor, while decent in recent memory, has suffered from both lateness and weak editorial direction with respect to the overall line. Superman doesn't even have Superman in it nor a name artist. Not surprising that's not selling gangbusters, Robinson or no.
Guardians however has been stellar GROUP storytelling since it's launch, both in writing and art with a few minor missteps here and there. Even with a cast of close to a dozen at least, I bet any reader of the series could tell you a great deal about any of the D-list characters involved and it speaks to how well the characters and concept have been done. This whole Marvel space line is deserving of even wider recognition.