There's absolutely nothing extraordinary about this drama, but it does a very good job at being medium. Really!

Here's a few of my thoughts (no spoilers)

Writing - It's a shame that the bullyng and the characters traumas weren't really developed. It had a lot of potential, but they just covered it with comedy. So even though the drama has interesting and important topics, they weren't explored as they should.
Also, why so many embarrassing scenes? I never skip scenes but this button was definitely used on this drama.

Couples - The drama focused so much on the romance that at some point people forgot about the first plot, Lim Jun Kyung problem with her appearance and the bullying.
The whole "Who's she ending up with" wasn't necessary and made the story worst in my opinion. But I liked the final couple, so I'll give them that.

Acting - None of the actors showed a award worthy performance but they didn't disappointed me as some people said they would. It's decent.

OST's - I loved every single song in this drama!

True Beauty made me laugh, tear down, made me angry, sad and root for the characters. It's worth watching and I recommend if you're looking for a funny, silly, easy watch drama.

Overall it's pretty decent although I wouldn't watch it with my friends who aren't part of this kdrama world cuz it would be embarrassing. A true guilty pleasure.