Series in one sentence:
One Punch Man, but with less comedy and self-awareness.
Series in more sentences:
A boy is gifted with immense psychic powers, but prefers not to use them and instead live an average life. As these powers tend to take over his body when he becomes too emotional, the unpopular high school student suppresses his feelings and swallows the mean comments thrown at him at a daily basis.
While seemingly absent-minded, he has his heart at the right place and always wishes the best for everyone, including the scam artist that took him under his wing and abuses his powers for monetary gain.
Series in one selective, crusty image:
The general plot reminded me of One Punch Man, which makes sense, as it's made by the same gentleman. The similarities urged me to compare the two, and while Mob Psycho is awesome, I found One Punch Man better for a very long time.. until its second season came out, and it became undeniable that Mob Psycho's animated story in its entirety makes for a better watch.
I would've liked it if the series was slightly more casual about the dangers it presented, though. It had funny moments, but I've seen enough animes with the same type of jokes and imagery; it's not an overdramatic/comedic masterpiece like One Punch Man. I can't pinpoint what differentiates these shows from each other exactly; maybe that Mob Psycho's story wants to take its characters more seriously? There's a noticeable conflict within the psychic community about what they should do or feel towards normal humans, for example.
It wasn't my intention to compare the two shows as a review, though. Mob Psycho doesn't deserve it, but when you watch it, it's hard to ignore that its main character is almost a copy of Saitama. Just without the urge to become anything other than normal, and being surprisingly fragile, still. He's described to be unusually powerful, but it's like the series sometimes tells him to "slow down, bitch", so there's still a conflict to carry over to season 2.
The main excuse the series gives for Mob's reluctance to fight is that he wants to protect people from himself.. even when the people he wants to protect are in lethal danger caused by someone else. A weird way of doing things, but alright.
Anyway, this one deserves a watch. It doesn't matter if you've seen One Punch Man or not, I think it'll please both groups just fine. It's the product of a mad genius that the manga and anime industry is lucky to have.