It's Thursday, and we got a rebus! The old-fashioned kind of rebus! The kind where the trick is visual, as in WALKING under ALADDER! or a BLACKCAT crossing ONESPATH. Both of these, and one other action, are BADLUCK! (Except, if you actually agree with the cat one, you should really read this.) I applaud this old-school rebus theme!
I also applaud some of the fill. UNIBROW (18A: Prominent feature of Bert on "Sesame Street") is given a great clue, and maybe an even better one is 42D: Prevents from stealing, say (TAGSOUT). Hah! The Three Stooges (SILLINESS) is always a welcome addition, and although it seems rather plain, I really enjoyed REALISTIC for "36A: True to life."
The NE and SW corners cut what could have been seven stacks into a bunch of threes, which does, I guess, allow for some nice down material, like FIREFLY (11D: Night light?), RECITAL (40D: Music event), and, well, ALIGN (10D: Harmonize). The others are less exciting. And speaking of less exciting, I noticed a lot of ETA, TATI, SSRS, NSEC, EST, IDEM, GMT, RGS, and the classic ENA. I didn't include TSAR in that list, because it has a better-than-average clue today - "37D: Target of a 1917 uprising."
So there's a lot of junk, but I'm blaming it on the constraints of what I consider to be a very strong theme. And in my opinion, anyway, a good theme counts for a lot. I'm giving this one a thumbs up!
p.s. I can't decide whether to be relieved or disappointed that they didn't try to tie together STALKS and CORNMAZE.