[quote=@Sundered Echo]
I personally like to portray biotics specifically more like in ME 1/the lore. That is to say, slightly longer cast time, much longer 'cooldown' and a much more significant effect.

I tend to portray tech more like in ME3, with quickish cooldowns and less extreme effects. That said, I never really spam powers in combat here, nor do I assign a really specific number of powers to any given post... I just go with what feels right and balanced.

Another thing to note is that typically enemies will have the same things we do, unlike in the game where the enemies all get a specialized and usually weaker set of abilities comparative to shep.
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For biotics, I think it should kind of depend on what you're doing; the more of an impact you want to inflict on your opponents, the more energy it requires and the longer it takes to recover from. For example, using a biotic push to just knock someone off their feet would take less effort and you would recover faster than if you threw them across a room, and would have even more of an impact on you if you tried it on multiple people.