As someone who writes their own adventures, I am feeling very "meh" about recent 5E releases.
I mean, for me, we can discount any adventures. I'm not saying they're bad. They could be amazing, but I'm not running other people's adventures, my main group isn't into that and I haven't really enjoyed it since, well, the 1990s.
So looking at the other material, we have:
Eberron - I like Eberron, but I didn't particularly need specific 5E rules for it (especially as they don't really change anything up, for better or worse), and just personally and for my main group, I know we're not excited about Eberron-specific races nor Alchemist as a class. Also the best bits of Eberron will still primarily be covered in previous-edition books.
Acquisitions Incorporated - The very definition of "meh", for me. I like the PA guys, generally. I have no desire to play a campaign specifically like their one. It's basically aggrandized house rules/content here, in kind of a "meh" way, rather than exciting one.
Guildmaster's Guide to Ravnica - I'm not saying "No-one asked for this!", but this is TSR-like levels of "Really? An entire setting book?". I can think of some pretty obscure 2E stuff that was more in-demand than this. I read up on it to see if it was actually exciting, but it seems like it's profoundly unexciting. Even the race mechanics are pretty dull. Not mechanically bad, necessarily, but far from exciting. Really feels like a deep-2E TSR product.
We have to go aaaaaaaaalllllll the way back to May last year (so 1 year 4 months ago!) to find a book that was actually useful or exciting for me:
Mordenkainen's Tome of Foes - Totally solid effort, enjoyed, would buy more like this. Didn't blow my mind but is a solid, good product.
Then we're back in 2017!
Xanathar's Guide to Everything - Great. Players enjoyed it, I enjoyed it. Added plenty to the game in a good way. I can see you don't want to do this too often, but it seems like, I dunno, every two years would be reasonable, and I'm pretty sure we're not actually going to see another thing like this for another year or more.
Then we're into 2016 with Volo's and I don't think there's any definition of "recent products" which goes back that far.
So yeah, I'm with the OP. For someone who runs their own adventures, WotC have had a deeply boring set of products for the last year and a bit, and I feel like it's unlikely that this is going to improve.
Which is actually fine! If WotC don't want to sell me stuff, I don't have to buy it. I can keep going just fine with the content I have now. But it does mean the amount of money I'm spending on WotC products is drastically lower than it could be. If they're happy with that, I guess I'm happy with that. I spent, far, far more in 2E, 3E, and 4E though - and I would in 5E is there was anything fun to buy!