Apart from Jenkinson and the midfield sitting in front it sans Arteta, it looks good at the moment.
I'm nearly completely sold on the Koscielny - Mertesacker partnership at the moment, I guess if you had to look for a weakness you'd say the former was sometimes a bit reckless, and the latter has been caught ball-watching a couple of times lately.
Gibbs is good. Not totally reliable in terms of position, but mature and good enough.
Jenkinson is a liability, not just because he's a bit average, but also because that's well known so he gets targeted. Hoping Sagna will play most of the time.