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It's a bit disappointing that the computer won, but at the same time I'm glad for the 4-1 result. If it was 3-2, it'd be forever contested who was strongest. Lee Sedol's mistakes are already found by many people reviewing the games.
Aside from his losing moves, he had some weird strategies he thought would be effective because he's playing a computer. Game 1 he played outside of joseki. Game 3 he just tried to brute-force a ko fight because he'd heard that computers can't handle ko. But the ko he finally managed to get was just a picnic for Alpha, and at that point he had already put himself behind.
And at the same time, his time management wasn't great considering his opponent is a computer that gets stronger as the game goes on and the number of valid moves becomes smaller. For example in game 2, he was in byo-yomi from the early mid-game.
An interesting thing shown in the game Lee won was that AlphaGo kinda sucks at playing from behind. In Go you're supposed to give your opponents handicap stones if you are stronger than them, then continue to play patiently in a losing position until the chances for a comeback appear, usually quite far into the game. I have some doubts whether this program could play that kind of game.
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