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: Steven Universe
Alternate Character Interpretation: The second episode has some of this regarding the Gems. Is their request that Greg not involve himself in magical matters out of concern for him, or do they see him as a bad role model and made the request to limit his influence on Steven?
Or Greg is actually not responsible enough to be a full time parent? Or does he resent Steven for losing Rose Quartz?
As of "Cat Fingers", it may be more because of how inherently dangerous the fledgling powers of a Gem are (learning to use his Voluntary Shapeshifting powers resulted in Steven turning into an amorphous blob of cats and nearly destroying himself), and Steven's dad just is not up to task to keep Steven safe from harming others, or himself. "So Many Birthdays" further supports this interpretation, as Steven almost died when he couldn't control his powers, even with the Gems there to help him.
The show's theme song is just lovely. It's a keyed-up, more upbeat version of the aforementioned song from the pilot; just the fact that the song holds so much meaning to the Gems that they'd sing it all together is just awesome.
Steven. Mostly for the fact that he unintentionally causes most of the episode's problems with his lack of forethought. Of course, considering that Steven is supposed to be 'the ultimate little brother' he is supposed to be annoying, so perhaps this is fridge brilliance.
Pearl has received a somewhat mixed reactions from fans. Some fans find her quirks (She's a bit of clean freak, and is extremely protective towards Steven) to be boring or annoying, others find them find them funny or endearing.
Amethyst managed to break the base with her carefree attitude. Some fans enjoy seeing her let loose and have fun with her powers. Others find her misuse of her powers obnoxious and wish she would be more responsible.
Broken Base: The show moved to a slightly looser and less detailed style after it was picked up, which understandably upset fans of the pilot.
Crack Pairing: Pearl with any of the other Gems (except for maybe Opal, Sugilite, and Rose for now) seems to be growing in popularity.
After the events of "Arcade Mania", fans began shipping Garnet with TienShinhan because they both have a Third Eye.
Designated Protagonist Syndrome: A consequence of the premise is that some viewers will inevitably prefer the Crystal Gems' adventures to whatever Steven gets up to in Beach City. This works on a meta level though, because Steven would also prefer going on the Gems' adventures. It's also falling into a pattern of Steven or Steven's ideas saving the day every episode. Sometimes it works like when he has the revelation about the spinning dungeon as he was the only one indirectly affected by them, other times it gets to be a bit much to swallow such as him being the only one to stop a living mascot because only one Gem came to help and she was taken out by some ketchup for the whole battle.
Fandom Rivalry: Only a few episodes in and the fandom is locking horns with the fanbases of Uncle Grandpa and Adventure Time. Uncle Grandpa fans are mad that Steven Universe took its previous Monday timeslot, and Adventure Time fans see it as somewhat of a ripoff due to its superficial similarities. Ironically, Steven Universe was created by Rebecca Sugar, a former writer and storyboarder for Adventure Time, and thus, many Steven Universe fans are also Adventure Time fans as well. On the other hand, a lot of Steven Universe fans see Uncle Grandpa as terrible, thus fueling the rivalry.
Some Adventure Time fans are upset that Rebecca Sugar left to create her own show and are demanding that she return, especially the ones that feel Season 5 has been a downward slide since her departure.
Misblamed: There were rumors going around that the show's design change from the pilot episode was because of Executive Meddling and apparently low budgets. In reality, the change was done by the show's creator, Rebecca Sugar, and was created and finalized long before the pilot was leaked. In fact, the show's budget is much higher than the pilot's.
Moe: Steven. He's not called the "ultimate little brother" for nothing.
Narm: For some, a lot of the genuinely heartwarming moments can be ruined by the art style, which can border on Gag Lips at times.
What The Hell Casting Agency: Not in a bad way, but an odd way. The voice cast is a offbeat gathering of teen stars, pop singers, and radio personalities. It's almost as if a bunch of old friends in the entertainment industry had a reunion.
Steven. He tries so hard, and it's impossible to not feel bad for him when he messes something up. There's also the fact that he never got to know his mother.
Amethyst too on occasion, especially in the episode "Tiger Millionaire". She doesn't act like it, but she clearly takes Pearl and Garnet's criticisms to heart.
Toy Ship: It's hard not to see shades of this between Steven and Connie.
What an Idiot: During Onion's rampage, Pearl tells Steven basically what the viewers were thinking at the time: that he could have easily used the Replicator Wand to replicate Ranger Guy instead of giving the device to Onion.
What Do You Mean, It's for Kids?: A number of moments could qualify the show for this, but the most notable examples would probably be Steven almost aging himself to death or Pearl being stabbed through the gut and temporarily dying.