I really enjoyed his character development.
Some spoilers here if you haven't brought him to Thessia/seen the after-scene yet:
He's a giant jackass during the entire mission, rubbing the fact the Asari god was just a Prothean in Liara's face, but he kind of has a small change of heart and says something along the lines of..."As long as one Asari is alive, the Reapers have failed." or something that just made me go, d'aww, you big softie.