Paladins is really good imo, everyone always compare it to overwatch but when you actually play it there's some major differences, you can unlock all the hero's by playing the game or you can spend around $15 for all the hero's and new hero's when they get released. If your looking an alternative to overwatch or saving money paladins can fill that void.
I agree with warframe, been playing that recently. If you like dungeon crawlers i would suggest Path of Exiles. If you like tank or planes i would suggest War Thunder. If you like tower defense games i would suggest Dungeon Defenders 2.