Hi, I'm on a relatively new server (158), where most heroes in the Arena are still around level 55, and 3 stars. Li Twins is completely useless because while it looks good on paper, its healing and damage is at the very bottom. You may say, that it does two things at the same time so it doesn't deserve to be the best in both worlds. But the healing Li Twins does is just marginally better than Leon or Marianna. It's damage is right there with Lucius.
Because of its extremely low health/armor/magic res, it dies nearly all the time before it gets to use its ultimate. I was hoping for a hero I can use when I got the Li Twins, and it hasn't been useful anywhere. Currently sitting in top ten rank in our Arena daily, so I have tried to find a team to build around Li Twins. I believe this Hero is in need of some major buffs in order to be viable.