As much as I believe that as time goes by, we will see almost all genres adopt into an MMO-like standpoint, Destiny seems to do this in a rather shabby fashion. I detail some of the reasons below:
Question 1: Do you get rewarded?
Yes you do, with new gear and guns, however the amount of time you need to invest to get the greater gear can be considerable.
Question 2: How is the grind?
There is no question that the grind is certianly apparent in this game. Especially when trying to accrue vanguard marks (as opposed to crucibal marks). Vanguard marks mainly require you to play strikes, which are like dungeons in regular MMOs. However, because there are only a very short supply of strikes, this results in excruciatingly repetitive gameplay. On the other hand, if you like competitive multiplayer, I would find the crucibal marks a lot easier to accrue.
Question 3: Is this truly next-gen?
Yes, it looks pretty, however with its repetitive gameplay, lack of different things to do, and rather long loading screens (even on the PS4 and Xbox One), this is not what is expected these days.
Overall, I have spent over thirty hours playing and have reached level 26 currently. So as much as I feel the gameplay is repetitive, ofcourse it is still rather addictive.