The Mechromancer looks so awesome! Anything to keep in mind before starting with her? How does she play?
It's been some months since I played (have a lvl 72 Gaige), so I don't know if something changed, but
Gaige's most iconic skill (apart from her action-skill Deathtrap) is Anarchy.
Having anarchy (a passive skill), every time you kill an enemy or your weapon is reloaded automatically (so, by emptying the clip), you gain 1 anarchy stack. Each stack raises your damage and decreases your accuracy. Don't remember the %, but might be something like 1%. And if you
manually reload or die, you lose all of your stacks.
Anarchy stacks cap at 150 (there's a skill that ups this cap), so you'll do a lot more damage and your shots will go who knos where. But then there's a skill called "Close Enough", which makes your shots ricochet on the ground/walls, and if they then hit someone (or was it a guaranteed hit after the ricochet? I forgot), they'll do 50% damage (they can crit too). So, if you miss, you might still hit stuff, and the 50% damage reduced gets compensated by the anarchy damage bonus. It works nicely with shotguns and SMGs.
That's the basic explanation for what, I think, is her most common playstyle. Gaige support more playstyles, of course (like focusing on making Deathtrap a total beast), but it would be lenghty to type them out and I can't link you some other builds right now (there's plenty on the gearbox forums). And since you can respec your skills freely, you can always experiment stuff.
And I probably wrote too much to say too little, my bad~