X MARKS THE SPOT sounded out (pseudo-)phonetically at the starts of themers. I had a little laugh when I realized DESPOT was a stand-in for THE SPOT. It didn't totally work for me, since EX / X and MARX / MARKS are perfect homonyms while DESPOT / THE SPOT are not, but it reminded me of all sort of childhood jokes, i.e. "denial" is the longest river in Africa and "Denise" is the sister of de nephew. (groan)

I wasn't a fan of MARX AND LENIN as a theme answer, as it doesn't sound like a real phrase to me. Yes, Marx's philosophies heavily influenced Lenin, but it's not like they co-wrote something. Perhaps KARL MARX could have been a better choice, and moving the hidden phrase to the end would have allowed for a better DESPOT phrase, like BENEVOLENT DESPOT or something. That pesky EX wouldn't cooperate though, as there's no good phrase ending in the word EX. Rats!
Fun to get some theme-ish fill in BUCCANEER and OLD SEA DOG. The latter made me hitch though — SEA DOG and OLD SALT are terms for seamen, but OLD SEA DOG didn't sound quite right to my ear. It also wasn't as specific to pirates as BUCCANEER. Still, these two entries helped give the puzzle a heftier feel.
I don't mind a couple of minor dabs of crossword glue to hold a puzzle together. RRS, YDS, DELA, NATL, ANON … that's a little too much for my taste, but it's not far above my threshold. Although ARRR is thematic(ish), I have a tough time with arbitrary extra letters, like SHHH and OOOH. Feels inelegant to me.
Speaking of inelegant, BROADS hasn't been seen in a major crossword since 1990. I hitched on it, wondering how many women it would offend. I do appreciate the attempt at ameliorating it with the "impolite" qualifier, but I'd much rather not see any word listed in dictionaries as "offensive." I personally want my crosswords to be uplifting and fun, not insulting. I'm curious to hear from readers about this one.
Overall, some enjoyable fill in DJ SETS, MAKE PAR, A-LISTERS, and a few aspects that didn't hit home with me.