Wrex is an awesome character, and he seems very happy that the Genophage is going to be cured. One thing that is new to him in this game is that he's happy, and in his happiness, is cracking jokes (Krogan jokes, the best kind) and giving compliments.
"You've got a quad, Salarian"
"Ha. That's Shepard for you. What a quad."
It's not just Wrex either. Some other Krogans keep bringing it up. Is there any significance, or is this how Krogans talk?