As far as Paladins goes, I agree it isn't a straight Overatch ripoff. For one, at least it's a true F2P game and not a $60 game that uses cheap F2P elements like Overwatch does. Also, the objective and payload gameplay goes back to TF2, and hell the game even gives you TF2 skins if you buy the Founders Pack. However, some of the stuff there's simply no excusing. A good number of the characters are at best "inspired" and at worst complete rip offs of Overwatch characters. Even though the devs posted concept art and alleged gameplay footage from years back, A: That stuff is easily faked, and B: The sheer amount of similarities is too much too ignore. 1 or 2 similarites is one thing. There shouldn't be enough to make a 2+ minute video about it. The only other explanation is that Blizzard ripped off Hi-Rez, but I'm pretty sure they would have cried foul a while ago if that was the case.
It also doesn't help that they appeared to have ripped off Guardians of the Galaxy as well.
Still, the core gameplay seems decent enough and there weren't any game breaking issues I ran into while I played. I am NOT a fan though of the complete lack of tutorials within the game. It's very annoying to jump into a game where every character is very unique and not have any sort of way to try out what everything does before you get into combat. Hell, if nothing else it'd be an easy way to help sell more characters by letting you try them out in some sort of "demo" area with no enemies where you just get to try out stuff. Too bad they didn't rip THAT off from Overwatch.