MMO means massive 3 usual, 6 tops is just coop. There are at most 16 people in the Tower (you can't talk to them, just wave/dance). And I guess a similar amount in the zones. MMOs have lots of grinding and building your character (items), but at least your gameplay is more varied - you have crowd control for example...
And if the game is FPS, it's a really weak one - FPS games try to diversify gameplay, Destiny doesn't.
I did all strikes on Earth, Moon and Venus, 4 in total - that Servitor boss on Earth, the big chained dude on the Moon, that Archon dude that is just a "captain" with lots of HP and that shielded thing that's in the middle of a round room. And each boss fight is the same! Really... shoot the boss, boss calls adds, kill adds, focus on boss, boss calls adds, kill adds, focus on boss... 3 from the 4 bosses I killed even used the same (enlarged) models as regular mobs >_> Captain (Archon), Hydra (shielded one), Servitor (ball thing).
You need to cooperate with your team to kill them, sure - because you can't solo them (mostly due to the number of adds and limited ammo). The bosses themselves aren't anything special. They don't have any special skills that require coop, they just aim and shoot at you. And summon adds.
You say you don't play the game like me - so how do you play it? I'd really like to know. Maybe I'm missing something? I have told you guys what I think is crap right now. All you do is tell me I'm wrong, but not telling me what the fun stuff is. So what is it?
Also, game having dumb mobs and lame exploits is bad game design. They should have for example not allowed you to run away from an encounter...
I love RPG games, I love FPS shooter games, I love TPS games, I was really into MMO games a while ago. This game is not good at any of them and has nothing unique so far that screams "Destiny".
EDIT: To name a fun game that took MMO concepts and made a single player, FUN game from them? Kingdoms of Amalur : Reckoning. That game was a lot of fun! And it had grind mechanics and not that many attacks, but you could chain them, so it had a nice attack mechanism. But it was fun - there were many items, lots of things to do, lots of quests, places to visit too. Or Darksiders 2 - similar idea. You level up, you grind a bit, you find loot, bosses required tactics. Others can do it, why can't Destiny?