I never liked the Chuunibyou series. I tried watching the first season but dropped it in 4 episodes out of sheer boredom. I will never watch another full episode of Chuunibyou but for this exception, I grant it a solid 9/10.
One of the reasons I didn't enjoy Chuunibyou was because I couldn't sit through the 'fantasy action' scenes and I still skipped over the one in this episode. However, the story, cliched as it may seem to some, turns out sweet with good pacing and somewhat enticing dialogue. I don't even know why I enjoyed the dialogue, but it was whimsical and erratic enough to keep me entertained. That goes for their actions too especially between Rikka/Yuuta. (Oh, the things this couple does)
In a nutshell, being only one episode long, it is ideal for a quick, satisfying watch with a cast of rambunctious personalities to bring the simple plot to life.