Not bad DLC
If you love Tomb Raider, then this is worth picking up. The new challenge tomb is near the beginning and nets you a lot of salvage and XP. Just be sure to revisit it later when you have the grenade launcher upgrade. I forgot about that until after I finished the game.
Lara's outfits are fun. I spent most of the game in the Aviatrix outfit, but your mileage may vary. Her default look is really good as well.
The upgrades they give you are a little more sketchy. Lara's skills are in a tiered system, so this just lets you buy/unlock them early with XP instead of later. Convenient, but not necessary. Probably the best one is the Agility skill as it lets you climb faster and fall farther without dying. Handy to get around.
The multiplayer is actually decently fun. And this is probably where the DLC shines most. The weapons are really good and you don't have to grind 30-50 levels to get them like everything else. The multi characters are just skins, but I enjoy the executioner.
The new multiplayer maps are also really good. The problem with releasing DLC maps is then splitting the community between those who have them, and those who don't. Still if you have some friends or a group going, they are great places to fight.