I found a couple of purples, it's really neat. Lvl 19 now and defeated sledge on the first try
I'd probably say all of the bosses in Borderlands are pretty easy except maybe Crawmerax (Secret Armor of General Knoxx DLC 2nd playthrough end-boss). The last boss in the normal game can be a pain, but just like almost every other boss... if you don't stop moving, you're usually fine.
A piece of advice... as you're nearing the end of the first playthrough, try and keep an Electric element gun in your bag. You'll actually run into those guardian creatures in the second area (the one with Lucky) when you descend into this cave thing and the easiest way to kill them is with the fact that they're very vulnerable to electric damage.
Although, I tend to just use a very high accuracy gun and pelt the hell out of them. Class Mods with ammo regen are also very, very good. My Siren uses guns that shoot 4 bullets at once, and with that, she eats a
ton of ammo. I actually have a legendary SMG that also has ammo regen just in case I use too much.
lol! I was going to pick the chick, then decided against it precisely because I figured I wouldn't be looking at her much.
Just remember that you don't choose a character in this game purely for aesthetics ... each character has their own talent tree and essentially a specific play style. Siren is like a covert op, Brick a power-house melee character, Roland (Soldier) is well... a soldier and Mordecai (Hunter) is more of a sniper, but also works well with revolvers.
You do level your guns in this game, so you can technically use any gun you want. I do recommend trying to stick to one type of gun if you can, so you don't
waste your experience on a type you rarely use. My Siren has a few different weapons leveled a decent amount, which is a waste now that she uses SMGs so much. I remedied this on Roland by using Assault Rifles for everything (including sniping -- as I mentioned, high accuracy ones work well since leveling AR specialty actually grants more accuracy).