I enjoyed it. It wasn't great, but it was good enough. I'm hoping that the budget for the first episode wasn't much bigger then the rest of the series, because it looked pretty pricey and the quality of gadgets, set peices and CG might go down. Which would be a shame. I'm hoping for cameos now and again, as well.
Cobie Smulders(?) will probably be in the series more next year if it gets renewed as How I Met Your Mother is done this year, so that may help the show a bit. Here's hoping there are a few cameos now and then as well.
I figure with the 6 or so months between the movie schedule now, the show should be good for a couple seasons or more, as long as they keep in interesting and don't just rely on things like the Chitari(sp?) devices from the Avengers and everyone going all nferno-y ala Iron Man 3. If they bring in some minor, real Marvel characters it should really bump up the show's oomph.