Gamora, she was able to take it to Ronan which it itself is a big feat. She also showed how well she moves by escaping from being mobbed by an entire concert filled with crazed Universal Church members that were trying to kill her, without a Spider Sense to aid her.
The average GL isn't much. Now although Hal and the bigger names can be a challenge, and are very powerful, they have suffered time and again from embarrassing moments that have often left me saying "wow, it was that easy to take this guy"? I realize that me throwing Ronan out there might not be as good as throwing a Lantern out there, but the fact that she was able to engage Ronan without ducking and dodging, showed just how strong and resilient Gamora is. Was it a case of Thanos being too slow to match Gamora, or was it that Gamora is too skilled to be easily tagged by anyone?
I mostly remember Gamora dodging or blocking Ronan's attacks with Godslayer when they fought.
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Fatality was a good fight for Kyle too, until he got some training from Donna.