Reading the answers to this question have me a little wary about investing in grenades for my squadmates. Your squad never had access to grenades in the first 2 games, so I'm unsure as to whether or not it's a power worth investing in for those squadmates who can use them.
Do you need to micromanage grenade use (like Stasis in ME1), or will squadmates use them as long as you have "Squadmate Power Use" for them turned on? I so far haven't been micromanaging my squad as much as I did in the previous game (though I'm only on Hardcore right now, not Insanity), and if I need to heavily micro the grenade powers, I'm not sure I want to invest in them at this point.
Will squadmates actively use grenades to try to push enemies out of cover, stagger Guardians with shields, or blow up Engineer turrets, or are they just kind of haphazard with them? For example, the radius on Sticky Grenades is fairly low, so will Garrus take that into account or not?