8. "Heart of the Matter, Part 2" (season 7, episode 18)
Man, that image above looks so cool. That's just an indicator of how awesome The Flash's season 7 finale could have been, but its constant attempts to defy the most basic of logic in recent years prevented that from happening.
So why didn't fans enjoy the seventh season finale? For starters, the long-teased Godspeed saga was just another one of the many storylines butchered by the graphic novel format. Not only was it not given enough time to breathe by the time that the finale rolled around, it was handled in the most disappointing of ways. August Heart was a great character in the comics, with real potential for a powerful arc on the show. Instead, he was very one-dimensional and more often than not spoke with a terribly dramatic robotic voice.
Fans also hated the decision to give him an army of Godspeed drones (who just repeated "kill the adversary and his allies" over and over again). This made for an equally disappointing final battle in which none of the speedsters used their speed. The drones walked forward while all of Team Flash stood still, threw lightning, or clicked their fingers - all at a normal human pace. Jay Garrick charging his helmet with lightning and turning it into a frisbee was super cool, but that should have been the only moment like that. Not whatever this was.
The infamous lightsaber battle between The Flash, Godspeed, and the Reverse-Flash has also gone down in history as one of the show's most infamous, logic-defying moments. I personally enjoyed it, but I do see why fans just couldn't get around the fact that three speedsters never bothered using their speed to battle each other.
Season 7 confounded people throughout most of its run, so it's pretty fitting that it bowed out doing the same. I don't hate this episode, but I get why it generated so much head-scratching from fans.