I liked it. It was exciting to see all the Muppets in the background of shots and wandering around the backstage, plus I liked seeing poor Fozzie's interactions with his girlfriend's family. It looks like his character is definitely going to be heavily explored in the show, and there's a lot they can do with him.
The adult humor didn't really bother me because it really wasn't anything too risque. Probably in the minority here, but I thought the online dating/bear joke was pretty good. Could a lot of sex jokes get grating in future episodes? Yes, but it's too early to see if they're going to go down that road.
My biggest problem was the closing of the show, it seemed quite rushed. I wished they had done something with Kermit and Piggy, after their conversation backstage, in the final tag instead of Imagine Dragons. Unfortunately, it's not like they can ask ABC to cut down on the commercial time for more plot.
I'm very excited for next week's episode and can't wait. Still can't believe the Muppets are on network TV!