I liked the fact that the show was more centered around who these characters were rather than just emphasizing their amazing powers (which were actually a bit underwhelming). In fact, we didn't really get much of an orgin of how these people got their power, but rather we're left to just get to know who they are within this world. I liked that.
Of course there are the obvious stereotypes that we've already seen. The tough cop character with super strength, the autistic savant with an amazing power, the enchanting hotty, and the wise professor character. It is a very X-Men like concept mixed with the charm of No Ordinary Family. I could swear I've either read or seen a story that featured a character who was mysteriously shot in a closed cell, but I can't think of what it is...
I like it, and I hope it sticks around for a little while, but I don't like it as much as Falling Skies which I think has much more gravitas.