Is the Sabotage bad in MP if you spec if for pure synthetic hacking? Duration, Explosive Hack, Berserk
I found this setup to be quite useful in SP but I haven't played MP.
I think that is a non ideal way to spec it, since those evolutions only work against geth enemies, turrets and Atlas mechs, while making the power have virtually no utility against organic enemies. Additionally, I don't find the actual hacking aspect to be that useful apart from as a distraction, and anyway, the actual duration of the hack is also influenced by certain enemies. Primes or Atlases, for example, are only hacked for half of the listed duration. In singleplayer though, you can at least still hack two enemies at once, so using it for this purpose has more an argument in favour of it than it would in multiplayer. The actual evos I take depend on the class (for infiltrator, you can basically ignore recharge speed) and weapon weight, but I never take Berserk in single or multiplayer on any build.
At least try the Tech Vulnerability evo at rank 6. The most universal way is to put it on Tali. Use it against boss enemies or clusters of mooks, then setup tech combos with Shepard and your other squadmember. On higher difficulties, you can destroy Primes, Atlases or Banshees in literally a few seconds, and nuke entire groups with a single tech burst or fire explosion. Sabotage itself also primes for tech bursts 1.5 seconds after the cast, so if you hit with a fire based power (incinerate, carnage etc.) then tech detonator, you'll get tech burst> fire explosion> tech burst in a window of a couple of seconds, with the powers and combos all doing double damage. On insanity (assuming all powers are at rank 6), this will usually bring a Banshee down to a few bars of armor by itself, and assuming you're firing between the gaps, essentially kills her and everything else in a 7.5m radius. Very underrated power IMO.
Another use for the rank 6 evo is in melee builds. Both the Infiltrator and the Engineer's heavy melee are counted as tech attacks, so they are also buffed 100% multiplicatively (that is, after all other damage from fitness and armor/weapon mods is calculated). A melee infiltrator shepard with a shotgun omniblade from a properly specced cloak can kill any insanity humanoid with a single heavy melee if sabotage is cast beforehand, and it only takes a few hits on bosses. You can make the same build in MP with the Quarian Infiltrator (female) and the Turian Sabotuer engineer.