I took me several episodes of going "That guy looks just like Damon Wayans" before I figured out that he IS Damon Wayans ... Jr.
A sitcom that does the ensemble thing well and is consistently funny is Rules of Engagement.
That's one that I came to late, and have been trying to catch up.
I just saw the one where Adam and Jen are taking ballroom dance lessons. That cracks me up every time.