The loot and shoot genre is still fairly new. Just a few years ago there were only two kids on the block; Borderlands and Destiny.
Destiny was slated to be the World of Warcraft of the loot and shoot genre. The narrative, the gun play and the loot system were streamlined by other developers but Bungie managed to put them together in a way that felt new and fresh.
When the game released there were a few issues that seemed minor but occurred too frequently to ignore. The loot system tended to short change a player that put lots of effort into getting an optimal piece of equipment. At the time there was only one raid available and unless you managed to get decent gear you were stuck with running a handful of the same missions you've done a hundred times. There were also a small amount of strikes (missions based on the cooperation of a 3 man team), or you could always create a new character and do it all over again.
Sadly the Story also had a narrative that felt like it belonged in a more linear game and not this far reaching MMO we were promised, all in all, it was a disappointment. Then came the releases of The Dark Below and The House of Wolves. The Dark Below fixed the loot system (to a degree), introduced a few more story driven missions, a couple of strikes, a new raid, and gave the game a little more life. The house of Wolves did build on this with missions, strikes and fixed some minor things but instead of a new raid, it added a new social hub and a PVE game mode call Prison of Elders.
At this time you probably noticed I haven't mentioned the Crucible. This is because I am not a fan of PVP. This is mostly because I suck at it and also the crucible tended to be a mixture of unbalanced weapons plus a Call of Duty/Halo format of gun play and community. Not exactly an attractive feature to a person that enjoys games for their story. So up until this point it was a choice of one repetitive thing or the other. With the introduction of the Prison of Elders they introduced a new gear grind that was slightly different. A bit faster paced and even more rewarding, it was much easier to reach end game levels and feel on top of everything.
However once we had a solid game Bungie decided to re-write the entire thing. Though the story and the missions stayed relatively the same, The Taken King incorporated a few new features that would change even the base game. First, there was the introduction of quests. Even though it is a basic way of following the path the game wants you to take, it wasn't necessary as the missions were very linear to begin with. After that certain weapons that were deemed unfair were mothballed and left in a categorization of “Year 1 Gear/Weapons”. “Year 2 Gear/Weapons” had improved stats and were much better. The Taken King added more narrative, a few more missions, a new raid, strikes, a new explorable area. They even added the voice of Nolan North as your ghost companion. Lastly they changed some of the older content to put a Taken King spin on it.
So that leaves us with The Rise of Iron, the latest and supposed last (due to rumours of Destiny 2) expansion for Destiny. Although the expansion gives a new quest line, missions, strikes, a new Raid, new explorable area, and a new social HUB; it seems more like DLC for the Taken King.
New weapons and cinematic scenes are convincing but seeing as the only real difference is more time spent in a few different areas; it all seems a bit lackluster. One would think that after everything I just said, I don't like the game. That's not entirely true. I have plenty of fun on Destiny and as long as I have one or two friends to play with. Unfortunately I can only play about an hours worth by myself before I get unbearably bored. I wouldn't pay full price for this game unless you have a dependable group to play with. In short, Destiny is a decent game that is fun with friends but I wouldn't pay $60 for it.