Personally, I was a bit reluctant to play with three players. But finally I'm really enjoying it. I must admit that this may also be because my results are good compared to previous seasons 
The games are indeed longer for the same number of Arena points (a win against two players counts as a single win, second place counts as half a win and half a loss, and third place counts as a single loss). I think this explains why the top scores are not as high as usual (fewer games played).
I feel like the game is less harsh in the sense that you see on average more cards (in your hand or on the tray), more food and more eggs, so there are no completely awful games where even if you play perfectly you can't win. Skills seem to be more valuable with 3 players, but I understand WingspanGOD's point about the possible 3rd player ruining the game to our disadvantage. This hasn't happened that much in my games (and I'm very fond of social birds, so I may be less exposed).
The games are indeed longer for the same number of Arena points (a win against two players counts as a single win, second place counts as half a win and half a loss, and third place counts as a single loss). I think this explains why the top scores are not as high as usual (fewer games played).
I feel like the game is less harsh in the sense that you see on average more cards (in your hand or on the tray), more food and more eggs, so there are no completely awful games where even if you play perfectly you can't win. Skills seem to be more valuable with 3 players, but I understand WingspanGOD's point about the possible 3rd player ruining the game to our disadvantage. This hasn't happened that much in my games (and I'm very fond of social birds, so I may be less exposed).