5. The Charge: Substandard as an Engineer
The Evidence: TOS, TMP, TWoK, STIII.
Ever notice how when something was really broken on the Enterprise Mr. Spock would eventually have to go fix it?
This happened more than once in the series, but reconsider the movies. In TMP, Scotty has been with the whole refit of the Enterprise, but can't figure out the fuel equations to get to warp. When Kirk insists that they go to warp to intercept the BDO threatening Earth (Kirk was pushing here, but going to warp is like taking an elevator in Trek) they wind up in a worm hole. Heck, it wasn't even Scott who entered the solution - he stood back and had and underling take stab at it:
ASSISTANT ENGINEER: That's it, sir. I can't do any better.
SCOTT: Aye, lad. It's borderline on the simulator. Captain, I canna guarantee that she'll hold up.
So here is Scotty, on his ship, working over the refit he's been overseeing for 18 months. And he can't even get the ship to warp. Spock shows up, and like 5 minutes later they have warp drive. Miracle worker?
Star Trek II - Scotty saves the day? Scotty takes the bullet for the team? Nope, it's not Mr. Scott - he knows what they're up against and he should've also known that he could also manually put the mains back on line, but NO - Spock has to hike all the way down from the bridge and kill himself because Scotty can't fix the ship. Way to go Scotty!
Star Trek III - they're hit by like one shot from a dinky Bird of Prey and all their systems are fried (because that's how Scotty does things - the Enterprise is always wired like a Christmas tree when he's doing the fixes). Result? Kirk has to destroy the Enterprise and they have to transport to the planet.
Significance: The only reason we put off with Scotty being drunk all the time and stabbing random Argelian women is that he supposed to save you when you're in a fix. But it turns out he only looks good because he inflates repair estimates and when you look closely, it turns out Spock was really the Chief Engineer.
That stabbing random Argelian women line had me cleaning coffee off of my keyboard thanks.