These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Owl City
Awesome Music: "Fireflies", "Alligator Sky", "Deer in the Headlights", "To the Sky", and, if you're not part of the people giving flak about his post-Shooting Star material, "Good Time".
From The Midsummer Station, Metropolis and Embers are also pretty awesome.
"When Can I See You Again?" from Wreck-It Ralph definitely deserves mention.
Base Breaker: The Shooting Star EP. One half of the base feels They Changed It, Now It Sucks and criticizes Adam for adopting a more 'generic' style, while the other half defends Adam by pointing out that he's just experimenting and developing his style.
His decision to not provide his music for Glee was seen by some as a sign that he's homophobic (as he's a devout Christian). Of course, many other musicians have rejected their music being used on Glee for various reasons besides the show's focus on gay characters and Adam has never stated that his faith or attitudes toward any group had anything to do with refusing Glee permission to use his songs. The fact he likes both Doctor Who and Homestuck also leans towards debunking that theory.
Of course, you have some fans who are happy Glee won't get their hands on his music due to a disliking of the show.
Fridge Brilliance: A couple of lyrics have meanings that you need to think a bit about, but there are some pretty clever meanings: Fireflies has 'I'd like to make myself believe, that Planet Earth turns slowly'. The point, as this troper has realized over the last six months, is that it doesn't, life goes by too fast most of the time.
One lyric in Silhouette is 'the more I try to move on, the more I feel alone'. Doesn't this seem to remarkably sum up Adam losing fans over the development in his style in the Shooting Star EP and The Midsummer Station? Of course, it may very well also/in fact be a reference to Ann Marie.
Strawberry Avalanche is about... well, an avalanche of strawberries. It has candy-coated clouds.
Tear Jerker: "Vanilla Twilight" when you think about it, especially when coupled with "Lonely Lullaby". Both were written about his ex-girlfriend, Ann Marie, who was apparently his first serious girlfriend. "Lonely Lullaby" in particular is the most personal song he's ever written, making it all the more heart-wrenching.
They Changed It, Now It Sucks: Many people complaining that the new style of the Shooting Star EP is too 'generic' and that it's just not Adam's style. Never mind the fact that Adam is known for experimenting with new styles...
He Copied It, So It Sucks: A lot of the complaints his Hatedom gives against him is that his songs sound very similar to another electronic music act, The Postal Service. Some have argued that the direction he's taken since the Shooting Star EP/The Midsummer Station is in direct response to this.
The Woobie: From the opening lyrics of "Honey and the Bee", the bee Adam's using as perspective. Lonely, watching other insects splatter on car windscreens. He even says it 'but boy I need a hug'. And this troper would give the poor guy one...
Arguably this is what makes "Honey and the Bee" so touching. The fact that Adam sets up a poor lonely Woobie type, and then gives him a loving companion.