Looking over the finished grid, there are a ton of nice words and phrases. But boy, did this play hard, really hard, and I think it's in the cluing. And that's to be expected on a Saturday, for sure, so I won't want to seem like I'm complaining too much. Even so, I think I didn't enjoy this themeless as much as I'd like to.
I broke in at 2D: Something sweet potatoes provide (VITAMINA), but despite getting a few other words in that corner, 1A: Something that might be built around a police station (TVDRAMA) stymied me because I was convinced the first letter would have to be a vowel. As it is, I really like the clue for this one, and give it a B+. Meanwhile 15A: Came aboard, in a way and 17A: Not free were both generic enough that I couldn't see them.
I had to drop into the SW, which came easily enough: AMO and MORE were gimmes, and I love the Vladimir Horowitz quotation for PRACTICE. So even though I didn't remember LALANNE, it came from crosses, and I thought I was all set to jump into the middle section.
Only not. I couldn't see CAMBODIANS for the life of me (I was stuck on CustODIANS... just wrong). And MODELROCKET was just not where I was going. I was thinking "bottle rocket", but that didn't fit.
Anyway, I figured out the SE next. MRPINK was my entry there (great movie!), and Hope supplied MONO (very nice clue there). 53A: Keep close relations? (INBREED) - Ew! And clever. And I really liked 35D: "Brady Bunch" bunch (STEPKIDS). This was my favorite corner by far.
The rest fell when I finally saw what 31A: Swallowing worry in an old wives' tale (WATERMELONSEEDS) was getting at. Boy, that is a tangled clue. Seems like a TABLOID is not the only potential libel defendant recently. I hate ADSPEAK and RONDELLE, but I really liked 23A: Follower of a team (SLED). That's seriously tricky and took a long time for me to see.
CHANGEENDS is fine, just not what I've heard before - change-overs, change sides, switch sides, switch courts. These are all more familiar to me.
Anyway, it's a well-constructed grid. I just didn't love solving it as much as I thought I would.