I am only level 37 but have filled out Hunter to get to the end and now starting to add points in other trees. I know everyone was banging on about the Stalker tree being a Crit machine with Fade Away but with the skills I have gotten from the Hunter tree, especially the last one which lets you Crit on any part of the enemy I see nothing but red Crit symbols flashing up all the time. I use the Rakk Attack and the perks that give you an extra charge for it and 2 additional Rakks and they are great for shredding enemies, especially groups or ones that are difficult to hit. Also using the Acid Spiderant too which seems fine, he's good for taking the heat off me.
Jakobs snipes are amazing and can one shot most enemies, also Jakobs pistols are great too with the Crit ricochet. Torque shotguns pretty much break the game, get one with a high number of pellets, turn it on to sticky mode and just unload on bosses. When you reload the pellets explode but the damage multiplies by the amount of "gyrojets" stuck. I have one I'm using at the minute that has something like 97x12 damage and mag size is 5, doesn't sound great. However because one of my perks has a chance to add ammo back to the mag when you get a Crit and pretty much every shot gets Crits you can end up putting 15-20 shots in before it reloads and then when it does boom, watch as the enemy/boss is deleted. It's not worth using it on normal enemies as it's complete overkill so it's faster just to use a pistol and 1-2 shot them.
