I think PS4 gamers are probably enjoying Destiny because it takes solid gameplay mechanics Bungie refined over a decade ago, and puts them in a game which PlayStation gamers have never had on their platform... so I can understand why PS gamers are enjoying it so much. It's the "Halo" they never had... the problem is, it's not as good as Halo, it's boring and repetitive, it takes a step BACK from Halo on loading times and seamlessness, not to mention it's not a graphical showcase on any level, and Halo was.
I'm happy for PS gamers, though. Any who've resisted Halo and are playing Destiny are probably in for quite a treat... even if it is a little repetitive, uninspired, and outdated.