This guide is excellent, great stuff!
I have to say that I've played every class on Insanity & the CC Engineer is by far the least stressful. Basically, it changes the game from a TPS to a RTS. You simply have to establish a safe perimeter, use your drone, use AI Hacking/Dominate & watch the enemy destroy itself while you eat a sandwich, drink a coke, etc.... So much more relaxing than having to worry about shooting, etc.... Works for everyone: mechs, mercenaries, Collectors. Even Praetorian, which is the least distracted by drones, still can be very-slightly distracted sometimes & even just a little helps with those monsters (which I think are the toughest guys in the game).
Basically with a CC Engineer build, you can control the battlefield once you get 1 enemy to only health. At the max cooldown, you can have 2 enemies working for you at all times. Once they are the last ones left, you simply let them kill each other by controlling only 1. Once it's the last guy left, it's game over for him as he's served his purpose. Truly a completely unique way to play ME2!
Anyhow I tended to use Zaeed/Miranda mostly. Here's my final build for my CC Engineer:
Overload: 3
Incinerate: 3
Drone: 10 (Attack Drone, 40 pts base against everything + X% per 3 seconds, so in 3 seconds it's done 80 points [initial zap + 3 seconds later], even on Insanity it usually lasts for 3 seconds minimum against even heavy mechs, etc.... I tried explosive drone but it worked better w/Demolisher build. Think of the Attack Drone as another functioning party member & the Demolisher build as a bomb/remote grenade. Both are good, just depends upon build.)
Cyro Blast: 3
Improved AI Hacking: 10 (Area effects in this game are mostly crap except if it's >=5 meters like Singularity, Warp Explosion. The extra time however especially w/bonuses, allows you to have 2 AI allies constantly once you get their defenses down & they will last a long time due to 500 shield)
Mechanic: 10 The extra duration is exactly what you want for CC abilities (drone, hacking,
dominate)
Enhanced Dominate: 10 (same comments: more duration is more reliably helpful, can always have 2 organics working for me)
Anyhow, this build is definitely a completely different experience from all the running around/shooting/adrenaline pumping videos you see around. Completely different & mostly stress-free. I did die a few times when I was trying to figure out how to establish a safe perimeter in various battles but once you figure that out, it's literally a cake-walk in most fights. The Praetorian on Horizon wasn't too bad, I died once. Got my squad positioned right along with myself & then just patiently worked it down while my squad kept firing away & stayed alive. I can go through most levels never firing a shot basically & just enjoy the show (although shooting does speed things up)!
Anyhow I highly recommend trying the Engineer out w/Dominate for something completely different. You can literally get 2 additional squad members in every massive fight which makes a HUGE difference in stress. With the drone, that's essentially 6 team members total (including Shepard). No other class offers that opportunity & game experience.
thanks & best regards,
Pedal2Metal