Can a puzzle be categorized as "late Tuesday/early Wednesday"? I'm not complaining about difficulty. But I don't think this is really a Monday level puzzle. Witness 1A: Picking out of a lineup, informally (IDING). I don't like the answer at all, but having it at 1A on a Monday is unusually complicated to say the least. I give it a D.
Another example is 10A: Former "Meet the Press" host Marvin (KALB). Huh? Who? I see he's a fairly important person (who I've never heard of), but more to the point, he hosted this show for one year! I remember Robb NEN, who pitched from 1993-2002, but I imagine many had not heard of him either.
Anyway, the theme is good, in that I had no idea what the connection between the four initial answers would be, and the revealer, a common phrase (WEREALLSET) is a great twist. It's also nice that each item uses a different definition of the word "set".
I also enjoyed some of the down answers in the corners, including IMBEAT, LIBELED, SPAMMED.
On the other hand, LEOI. Also ELSAS.