The Bee is an excellent shield in certain circumstances but it’s very situational. I would not recommend using it in the final battle with Jack as you will get hit a fair amount, although once Jack’s out of the way it’s perfectly viable for the Warrior. There’s a sheltered spot to the far left of the map as you enter, which is a dolman with an ammo generator behind. The dolman protects you from Rakk and whatever the Warrior throws and the rising lava can’t get you there, either. As long as you are specced into Ruin the Crystalisks are very easy to despatch.
If you are lucky enough to have a Thunderball Fists the Warrior will go down reasonably quickly as he is vulnerable to Shock and the secondary explosions do wonders against him, especially with The Bee. If not then any fast firing weapon aiming at his Crit spot on his chest will take him down in short order, sped along by The Bee.
Maya is very versatile and what weapons you use is very dependent upon what COMs you have. If you have a good Cat COM, for example, then SMGs are a good choice as they can be massively boosted. If you don’t, then play to what complements the ones you do. Spec wise Maya is all about her Phase Lock, so I recommend putting points into things that both extend her PL (Suspension) and reduce cooldown (Quicken). If you are dying a lot then make sure you put points into Sweet Release and Elated (via Wreck). Chain Reaction, Reaper and Ruin are must haves, too, IMO, and now that Cloud Kill has been buffed again it’s worth the single point. Converge is also very powerful when combined with Ruin.
@CptErikku: if he’s using The Bee I would choose Ward over Accelerate, as it has a very long cooldown and is pretty useless if damaged. I would also take a point out of Helios and stick it in Cloud Kill now that’s been buffed