I have heard mixed reviews of the game when it first came out, and I understand there are some bugs to fix and patches, but what are the positives of this game?!
Positives: great engine and game mechanics
fun content, especially raids (some interesting platforming and maze stuff you wouldn't expect in a FPS)
decent weapon variety
fun classes
Negatives:
minimal content, right now (although, expansions / DLC is expanding this)
lots of grinding - both for RNG drops, upgrade materials, and reputation for factions
limited matchmaking system - only works for strikes (3 person dungeons) and nothing else
story is not wonderful and feels largely unfinished - because, it is according to former Bungie Employees
Even with that, I really liked it. It is fun.