I generally find it ok, however I have all my abilities keybound and on my 2 center tool bars.
One thing I find useful is grouping abilities. I have my DPS abilites grouped together, my cooldowns together, my CC, stuns and control grouped together, etc.
There are alot of abilites, but I find if you group them like this and put similar abilities together on your binds, you get used to positioning.
i.e. I have dps abilities on 1-5, AoE S1-S2
CC, inruppt, and distance makers, and CC breakers on a,s,d,r
And defensive and offensive cooldowns on f, t, g.
As for DPS rotations, enter cover, throw sticky bomb, burst, DoT, aimed shot and either burst until out of energy or alternate an energy using ability and a no energy ability to keep myself in the high regen range, bursting and using colldowns to put me back in the range as necessary.