by Scorpion0x17
I think the 2 player problem comes from the mechanism for entering and leaving Tokyo.You gain victory points at the start of every turn in which you start your turn in Tokyo.
However you can not heal whilst in Tokyo, and can only leave when attacked.
Also, if the player in Tokyo leaves when attacked, then the attacking player must enter Tokyo.
Players outside of Tokyo can only attack the player in Tokyo, but the player in Tokyo attacks all players outside of Tokyo.
So, in a two player game, it makes sense for the players to simply not attack each other and try to gain victory points as fast as possible, or to leave Tokyo as soon as attacked, and do as much damage as possible to the opponent whilst in Tokyo.
It seems like it would take away much of the risk/reward nature of the game play.
I've yet to play it two player, but this opinion is based on the games I have played.
The expansion may change things a bit because the monsters are no longer functionally identical, so some may benefit more from staying in Tokyo than others.