I'd say... it depends what your threshold for Kitty, Colossus, Wolverine and Kruun (from Breakworld) is. If your a fan of those characters, you;d probably like it. Writing was decent, but nothing revolutionary. I can say honestly, I know people who gave up on Uncanny X-Men who picked this up and decided to buy the issues, instead of read in-store (whole part of giving it up thing)  
 
I wasn't a big fan myself, themes it sort of delves into is I guess, duty, redemption? I tries and deals with Kitty's current phasing problem. Art is by Dodsons, and that might be a factor. I'm looking forward to the next arc, but think Gillen could have chosen better cast and plot to start his Uncanny run. I just found this arc wasn't anything special or... characterization was decent, as in true to characters, but I didn't find what they were getting up to, too interesting. I'll end by saying I am a fan of Gillen, I do tend to be a bit harsh with Uncanny title... I think you can skip or read issue summaries (unless your a Kitty, fan. Maybe Colossus. Wolverine gets involved in second part of arc. 

If you're an X-Men fan, I'd say definitely...  The story and the art was good.

Not a massive Colossus and Kitty fan, though, this arc was really good. Certainly the best thing to happen to Uncanny X-Men for a while. I especially liked the little details, for example, Magneto's curiosity with the Breakworld metal, the exploration of Kitty and Colossus' relationship, the adherence to Whedon's run etc.

@John Valentine What's your opinion on Gillen's writing?

Eventually the X-Men would get tired of her snobbyness and bring Cable back from the dead to set her straight :P 
 
That reminds me, the New Mutants are currently searching for Nate Grey. Is there any hints from Marvel about Nate Grey, Cable's arm, and AOA Jean Grey crossing paths ? It feels like all these pieces are meant to come together especially the missing Nate Grey, and Cable's severed arm.

Just read the first issue (#535). Definitely a good comic.