Continuously chaining more than 2 attacks gives 2-5% Power. Stacks 10 times.
12-24% Rending on Enemy Weak Spot Hit for 3.5s. Stacks 5 times.
1-4 Burn Stack(s) on Critical Hit to a maximum of 3-12 Stack(s).
4.5-6% Close Range damage on Repeated Hit. Stacks 5 times.
Lasgun has near infinite ammo with Shock Trooper. Crits with Infernus & Onslaught melt bosses/ogryns/elites (and everything else). Don't ADS unless shooting long range because you lose mobility.
Rarely need to swap to melee. Only when surrounded by a horde. Shovel infinite heavy combo is great to stagger the horde off you and make space while doing good damage.
Use grenades and VOC liberally for hordes as well.