I like the inversion of this thread from the typical '10 best' list. I'll do mine in production order.
This is going to be good!

"Shades Of Gray" - There are FAR better clip shows in scifi.
Or any other genre. The non-clippy bits were actually pretty good and sold a real sense of threat and alienness on that planet. But once they probe Riker's thoughts... it was TNG revolutionizing bad television just before revolutionizing great television...
"The Price" - This episode just felt so flat. But what makes it terrible is it gave us "FALSE PROFITS" on VOYAGER. Unforgiveable.
I remember the good old days of 1989 when people were screaming in how nerds and geeks were being appeased with this "pornotrek". Uh... not quite and regardless of nerdery or otherwise, it's a shallow veneer of a story. The Ferengi subplot was okay, though...
"Transfigurations" - Just dreadfully boring.
It's not the best, though it made for a watchable allegory. Could have been a lot better, even despite late season 3's production problems...
"The Masterpiece Society" - Boring episode. VERY boring episode.
And so one-dimensional. A partial retread of "Pen Pals", but using a sledgehammer the size of Saturn's seashore to say "Durh, nevva interfere." The ending to make it all fail was even more contrived than the setup. Even by 1990, there was redundancy... this episode eschews it in a pallid attempt to make a point that's a point that's BS at its core too... ugh.
"Imaginary Friend" - Very boring episode.
IMHO passable, but definitely intended primarily for children. I wonder how many kids sat through it... I wonder how many fewer liked it.
"Rascals" - Ferengi with 2 outdated Klingon ships take over the Federation flagship? Not only does this sentence sound more like a joke than an actual premise, but it is the one episode that makes the crew look COMPLETELY INCOMPETANT.
No worse than "Generations" in how 1 outdated Klingon ship destroys the Federation Flagship...

"Aquiel" - This episode is painfully dull.
As much as there are episodes to genuinely hate, this one doesn't engender much of any emotional response, though the personal log stuff was a bit creepy. With everything else being boring, that's not the direction you want the episode to segue into...
"Force of Nature" - This episode just ended up going nowhere. It's one of the few episodes that is worse because of the existence of others. Had the warp speed limitation actually been around for more episodes, this might not be quite as bad.
Later episodes did say "you're authorized to exceed"... so many that it didn't matter. Not to mention, worsening the issue and possibly killing everyone to prevent the message from getting out sooner (much less the chance nobody would notice, or get into the anomaly then escape it to tell the tale...) Ugh...
"Sub Rosa" - Beverly has sex with a ghost? This story came from Jeri Taylor, who was the head of the writers' room in season 7. The only woman on the writing staff, and THIS is the best you can come up with for your most underutilized character of the lead cast?
It gave us this, albeit a couple decades later:


"Bloodlines" - This story was useless. It could have been an exploration of the choices Picard made about not having kids. Instead, it's another Bok revenge story. Just terrible.
Dishonorable mentions...
"Angel One"
"Up The Long Ladder"
"Bloodlines" - yeah, Bok's revenge was done already and better. And in season 1, "The Battle" is considerably superior. Didn't "The Inner Light" also try to touch on Picard not wanting kids? Not the best story either but it did a better job too...
"Angel One" - yuck. Cheesy and by-the-numbers.
"Up It" - some great sci-fi and philosophical ideas wedged inside a plot loaded with cliches and hammy romance shtick that doesn't do much to inspire... other than laughter over Riker...