Well I just beat the game (yay) and these are the three weapons I finished with. I used em pretty much since the Salt Flats. Kinda sad that I finished at lvl 36 and wasn't even using a lvl 30 gun.
Oh and yes I had a fourth gun... I pretty much just kept switching it out with various revolvers, shotguns, and SMGs (even a rocket launcher once) to try them out, but nothing ever stuck:
My primary in-your-face SMG. Accuracy like a shotgun but it was my up close and personal gun. Did a good job of shredding the hell out of whatever was too close to me. I even used it on the final boss simply for the hail of bullets scoring lots of crits, plus a SMG damage class mod and a crit skill. Big damage. Reloaded super fast and emptied the whole clip in almost the same time.
My mid range gun. I wish it had a scope (the rifle it replaced had one, and I LOVED it) but the fact is she threw out so many little explosions it didn't much matter. Probably the least used of the three, but it still served it's purpose.
Behold the weapon I finished the last half of the freaking game with!
No, seriously. Ever since I got it I was just a sniping machine (even though i'm playing Lilith and not Mordicai). It might not be much to look at, but it shoots straight as hell, does good damage when it hits, and most importantly, goes BOOM! Honestly when I first snagged it I wasn't sure about using it, seeing as how everyone is in love with fire based snipers. But this gun changed my mind. I could take aim at a pair of crimson lance, MISS, hit the wall right behind them - and STILL kill BOTH!
What's not to love about that?
Edit: I forgot to mention how awesomely hilarious it is to headshot someone and watch their gibs pop straight up in the air. Like 100ft in the air. Its freakin awesome
Well, off to start the second playthrough... and maybe some half decent weapons.