In terms of pure fun, there are few games which can match Overwatch. No, it doesn't have a story, that's left to external material like web shorts and comics. It doesn't have any sort of single player campaign, but it will be a long time before you become tired of the modes the game does have to offer.
In addition to the addicting normal matches, which I'd dumped over 300 hours into, there are also the game's new modes, such as 1 on 1 matches, 3 on 3 elimination matches, and a variety of 6 on 6 matches with special rules.
The game is bright, colorful, and its cast of characters are all incredibly diverse and lovable. Overwatch is my all time favorite FPS, and I can't recommend it enough.
Overwatch is available for PC, Xbox One, and PS4.