At this stage of his career, Luongo is excellent with a shooter bearing down on him, but he's below average moving laterally. His angles and ability stop the first shot is as good as anyone in the league IMO but he just cannot go post to post quick enough or while staying upright.
IMO Eddie Lack is probbaly right there with Lou in terms of ability. Lack, like Luongo is good at taking away the net with his size. Unlike Luongo, he can move laterally without falling down. Wouldn't be surprised in the least if Lack is deemed the better player by the end of the season - though Tortorella would have to give him more opportunities to prove it, something that may not happen.
Kassian's performance was very uneven but he also had the nice setup in the 1st to go along with his goal. Unfortunately, his linemates haven't converted a single one of his passes this season. Would still like to see Kassian with Kesler a some point. They should compliment each other well, and Kesler would help cover for Kassian's poor defensive game.