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Big year for this, with a lot of the most rapturously received movies and big awards contenders being fine to even good but way more minor and unexceptional than you'd think from the crazy high levels of acclaim. I'll break it into two categories, those that are actually bad and those that are good or fine but never approach the greatness they've been ascribed.
Actually bad or terrible movies most people and/or critics mistook for good ones:
It (the second worst movie of the whole year)
Patti Cake$
The Little Hours
Super Dark Times
Wonder Woman
Split
The Killing of a Sacred Deer
Baby Driver
Oklahoma City
Wind River
Mudbound
mother! (mostly just the critics here)
Raw
A Quiet Passion
Merely good or decent movies most people/critics/award bodies mistook for great ones and wildly overpraised:
Lady Bird
Call Me By Your Name
Dunkirk
The Big Sick
Blade Runner 2049 (these top 5 especially)
I Called Him Morgan
The Shape of Water
Three Billboards Outside Ebbing, Missouri
Lady Macbeth
Personal Shopper
War for the Planet of the Apes
Brawl in Cell Block 99
I Don't Feel at Home in This World Anymore