The Abrasive Side
I found this episode to be great, much better compared to it's partner. The jokes were fresh and I loved that they had lots of call backs to older episodes (Grandma - Grandma's Kisses, Glove World - Rock Bottom, "I Wouldn't hang out with you for all the money in Krabs' mattress" - The Lost Mattress) The plot was fresh as with many other season 7 episodes, I found it to be sort of like Overbooked but they managed to change it. Everyone was in character and I found Mr Krabs to be surprisingly funny in this episode. So it's a great episode that has great characterization, jokes and something we don't usually see in Spongebob: continuity.
Score for The Abrasive Side: B+, 4/5, 8.5/10, Amazing
Earworm
This one was kind of a let down, It wasn't bad I just thought it lacked something. The song was catchy (I found myself humming it) but I did think that after Spongebob got the song stuck in his head the writers couldn't think of an idea for the ending so they just introduced a real "Earworm". The ending was quite good but still the episode wasn't that great. I liked that they had Sandy (In both episodes) and she played quite a big roll. So it was not bad not great just a fairly average/good episode from the seventh season.
Score for Earworm: B-, 3.5/5, 7/10, Good
Overall: 79% - 8/10