As a drummer myself, I natuarlly tend to listen out for the drums whatever I'm listening to. I was really impressed with Matt. His playing was pretty understated, but he cut loose when the song called for it. (check out the fill towards the end of Silent House)
From exeperience, it can take a few gigs to fully integrate with a new band. Think about it this way - Matt has been in the band for how long? a maximum of 6 weeks?? and with the amount of time they have been in the studio recording new stuff, he's probably had a maximium of 2/3 wks to rehearse something like 35 songs (according to JW's blog), so he's got a long way to go towards learning them yet.
So, when they get out on the road in October, I predict we will see an even better, more confident Matt. The fact it was a very public first gig, with people and cameras all around and above him, may have made him more nervous - it would have done me! Drummers like nothing better than the dark corner of a stage to hide in!