I would much rather have it been Sawyer in the coffin.
I didn't really like the finale. It answered a lot of questions, but it didn't have that *big* finale feel to it. Season 1 had the opening of the hatch, Season 2 had the Michael turn/Others capture and the key turning explosion, Season 3 had Charlie's death and the flash forward.
This...this had name dropping (Boone and Ecko) for the sake of name dropping and Locke, who was the safe bet, being the person in the coffin. The ending and the Desmond/Penny reunion were very anti-climatic. Oh, and the shitty Michael storyline comes to a shitty end.