Not sure why everyone feels the need to complain about a map every time there's a tournament but there are good reasons why people choose Summoner's Rift.
1. People can go back to heal and get items any time, not just when they die.
2. The point of a 2v2 in this case is to see how well two people can work together in a duo lane, not to see how well each person can push a separate lane.
3. **** you, it's not your decision because you're not in charge of the tournament. If you don't like it, find another tournament or make your own.
Also, free bump.