User blog comment:Legionwrex/Best and worst sqaud mates of Mass effect 2/@comment-2174252-20110216174453/@comment-743796-20110217003607

If this was in terms of actual usefulness in the game, my two would be Mordin and Grunt. The former quite literally because you can't deploy ship and weapon upgrades without him, also as I said in another post, he's the only squadmate who can use incinerate, which is far more effective than incendiary ammo and inferno grenade (partially stronger than that). Grunt on the other hand is because of his high durability in battle, which would help me out during the majority of the game due to his high health and fortification ability.

As for least useful, that would be Legion, as Kasumi and Tali already have decent tech abilities, and even though he's the only squadmate who can use the M-98 Widow, he deals 43% less damage than if Shepard uses that weapon and others using Mattocks are quite a bit more effective.