This is a strange and not very helpful way for me to provide feedback, but hey, brief comments for every stat in a stream of conc fashion.
Weapon-specific:
+%Attack -- No probs. Useful in customization.
+%Ammo -- Good for specializing in certain weps.
+Range -- Super useful. Probably the closest to being exploitable (if you outrange enemy there's nothing they can do). Still don't mind it personally.
+%Splash-radius -- Useful...maybe too useful. The rocket launcher is a BEAST stacked with radius. Actually, Rocket Launcher seems comparable to the Plasma Rifle, but with more ammo. Maybe a little OP?
Shield-related:
+Shields -- Don't pay much attention (surprisingly). Quite easy to make exos tanky if you choose to.
+Regen -- Use it. Exciting skill. No probs personally.
+Damage-reduction -- Boring. Don't pay much attention, but it seems to work anyway. Sometimes an enemy hits me and does minimal damage.
Propulsion-related:
+Stealth -- Fun. Tactical. Useful!
+Overload -- FUN! Not that useful, but I still love it. Especially the giant explosion on death you get.
+Trap-skill -- weird. Almost like a non-skill. I pay minimal no attention to it. The trap avoiding, anyway. Didn't know this affects trap placement also ...for some reason.
Computer-related:
+Sensors -- Yeah, useful.
+Hacking -- Useful, but boring. When is hacking ever 100%? Where's the "oh s**t they're onto me!!" (siren sounds) after failing a hack.
+Virus -- Useful. Entertaining results. Not much danger in using it. Could be chance of success based.
+Mines -- Use these when I'm in trouble to barricade myself away.
+Sentry-turrets -- Cool. Useful.
Second-order:
+%Power-generation (exo-wide) -- Seems OK.
+%Attack (exo-wide) -- Useful.
+%Shield-related-stats (exo-wide) -- Don't pay much attention, but sounds good, and it's clear what it does.
+%Propulsion-related-stats (exo-wide) -- Don't really know what this affects...stealth? (My own fault for not paying attention)
+%Computer-related-stats (exo-wide) -- Know exactly what it does. More loot hacks.
Other:
+Power-generation - Highly prized. Always look out for these in the shop.
+Power-consumption - Not highly prized.
-Power Cost of other parts in same system -- Try to use it cleverly, but seems a little weak. Also, much better in some systems than others (more slots the better of course).