Beamer wrote on Sep 13, 2010, 10:05:

Again, incorrect. You keep saying they aren't useful but don't provide any reasonable evidence to support that conclusion.

Fine.
Speed: As mentioned, this has some uses. Jumping high, at the very least, can save some time.
Walk Quiet: Just crouch. Same thing. Worthless.
Muscle: Pretty much only useful to set up stairs and snipe. Most of the time you can use speed to get where you want, anyway, and sniping isn't worthwhile until late-game due to horrible inaccuracy at lower levels.
Combat strength: seriously? Maybe useful if you don't plan to kill anyone, but since the game doesn't reward you for this play style, I'm calling it utterly worthless.
Environmental: Suits are always available, and even then I can remember using one once on my last, hardest difficulty play-through (back in July.)
Energy: I can so rarely think of any time I was attacked with fire, plasma or electric. At least not at a rate where activating this was more effective than keeping the fingers on the strafe button.
Aqualung: I always had more of these available than I knew what to do with.
Regen: Awesome. Awesome to the point that I was consistently walking away from medkits because I had too many.
Synth Heart: Good if you're not maxed out on what you use often. But you probably will be.
Power recirc: Always had enough power, never needed this. Plus it's not terribly useful before level 4, which makes it useless.
Cloak: Crouch or use a suit. Plenty of those.
Radar: At best saves you having to wait for a robot's pattern to hit where you can run by regardless.
Ballistic: again, not really worth losing that split second of strafe.
EMP: Energy is plentiful anyway. Worthless.
Vision: I maxed this out my last playthrough. Seemed I still couldn't see through most walls. Never really helped more than crouching and peeking.
Targeting: Pointless. Sword or headshot.
Grenade/Rocket protection: Seriously? Strafe out of the way.
Spy drone: used this often my first play through. Never got much help from it.