I liked it more than #1, there were many subplots going on at the same time but they were all relevant to the main story. The battle scenes were cool and seeing the guys explore Mars was especially entertaining. I also like the fact that Steve seems to have an energy shield, pity it's not the same as the one he head at the beginning of Avengers V3.
The only downside were the costumes adapted to space exploring, they all looked sort of similar. And a couple of characters, Moon Knight in particular, still seem to be struggling to find their place in the book.
I really liked #2. This book is fun, and i like the pace.
I kinda wish i hadn't picked up the "group shot" variant cover, though, pretty much a rehash of #1s cover. And i kind of liked Moon Knight's space-suit look, without the cape. It reminds me of when i first got the Marvel Legends Moon Knight, and immediately took off the cape to see what it looked like. But i agree, he doesn't really fit in with the team, so far.
I think Moon Knight and Valkyrie seem a bit out of place, or rather they seem like characters who will probably fit in really well when everything is revealled about the different villainous factions involved in the story and contribute some piece of the jigsaw but don't fit at all with regards to who Cap would call on at the start of the mission with the information at hand.
I get the feeling Valkyrie will come up with something crucial in the mystical stakes but i'm not sure that really makes up for her being used as an undercover agent in a role she was bound to mess up in issue 1.
Brubaker's earnt the benefit of the doubt from me as I've loved his Captain America and know that he is very good at the big picture stuff but some of the team choices stike me a little as making a lot more sense from a writers point of view than from cap's
I'm also not sure Nova quite works as his go to guy for space work either but i don't know the character very well and he seems to have a bit of a following these days that he has picked up while I wasn't reading comics. I liked his investigation of Mars but didn't really know anything about the whole Worldmind thing which pulled me out of the story a little.
But generally I liked it a lot, it built up a nice creepy old school sci-fi feel to the mars stuff and I felt the use of Rhodey and the Beast did work very well from an 'in-world' perspective without them being characters we've seen together a lot.
I'm liking this comic and I especially like how the artist is drawing Ant Man. He always draws him from such an angle that really shows his diminutive size--that shot of him hanging upside down from a wire was especially cool!
I'm not sure Valkyrie, as much as I love her character, is right for this team. I suppose when I think of "Secret Avengers" I think more of more stealthy characters--those who can fly under the radar. I think Moon Knight will work out in time.