Brainy Smurf is one of the main characters of the cartoon adaption of The Smurfs. Throughout the series, he is portrayed as an annoying character who was supposedly meant to act out as a moralizer to the Smurfs but turn out to be a bit talkative, boastful, and somewhat of a smart aleck and spoilsport character who is more likely to blab out, much to the annoyance of everyone.
Why He Sucks
He constanly boasts on and on about his knowledge, making him a big showoff.
He talks to much. Whenever he states out something, his sentences tend to be so long that it could get on the other Smurfs' nerves, resulting to him getting thrown off the village (which serves as the running gag of the series, making him the Butt-Monkey).
He can be a smart aleck at times. He would blab out something that is true but could lead to trouble, and even acting like he knows better that anyone, which isn't true.
He is also considered incompetent in most episodes trying to help around the village, usually resulting in anger from the others (especially Papa Smurf).
At times he acted like he was second-in-command of the village, using the excuse that he is Papa Smurf's assistant when he was actually Papa Smurf's lab assistant and apprentice, meaning he was confused.
He is unlikable in some episodes, mostly the ones where he is occasionally miscast as the antagonist dozens of times whenever Gargamel or the other villains are absent from an episode, even though he's supposed to be one of the good guys.
His villainous side debuted in the cartoon adaptation of "King Smurf". He ruled the village like a tyrant and started a civil war, though he does apologize at the end and is not as worse as his later appearances. In the original comic version, he was held captive as one of King Smurf's prisoners and is not the antagonist.
He was also unlikable in the episode "Clumsy Luck", since he was responsible for all the trouble Clumsy went though (when Clumsy broke Vanity's mirror, Brainy claimed that Clumsy got bad-luck and even tried to quarantine him, preventing him from having fun and seeing the meteor shower. And after Clumsy escaped from his house, a mediator crushed his house, causing the other Smurfs, especially Papa Smurf when he returned from Homnibus' place, to think Clumsy got killed and made a funeral for him. Brainy is also mourning as well (although it was all his fault, making him a hypocrite).Thankfully, Clumsy returned, and much to everyone's surprise, they were happy to see him alive and well the whole time. (Brainy also got what he deserved, but he never learns anything from it).
"The Smurfy Verdict" is another example. He framed Clumsy for the disappearance of Baby Smurf, although it was his responsibility to take care of him in the first place. He doesn't even apologize for framing his best friend and claims to finish off his case instead, lacking any empathy whatsoever. Being thrown out at the end doesn't trigger his empathy side either, he just complains about "Some justice."
He was a spoilsport to Grandpa Smurf's stories in the episode "The Royal Drum".
He doesn't have a sense of humor and can't seem to take a joke, as seen in "April Smurf's Day".
The Only 3 Redeeming Qualities
Although the other Smurfs get annoyed by his behaviour, they still love and care for him, especially Smurfette, who sometimes hates to see the other Smurfs bully him although she too despises his behaviour.
He was likeable in some episodes.
To be fair, the other Smurfs never give him a chance or at least tolerate him, instead they always throw him out of the village, even though they are meant to be kindhearted and forgiving especially to each other, but that still does not excuse his treatment.