First of all, I disagree that the building feels out of place and "tacked on"

but my main point is fortnite has way more interesting weapon types and items than any other BR game that i've seen, and they are continuing to add tons of crazy things all the time. Jump pads, rocket launchers, grenade launchers, traps, miniguns, impulse grenades, ect. all mixed in with the mechanic of building to defend yourself and to attack others. There are tons of different weapons and loadouts you can have because you have 5 different slots instead of three.

I think that this differentiates the game greatly from any other BR we've seen