Nuntius, If you still feel like reading this, I would like to point out the fact that just because of the other players pointing out how your character is broken, they obviously have problems, as they (or, I at least) did not plan on being super-optimized. When they talk about tiers, in this case, they talk about tiers of optimization, which (as far as I understand the idea) mean that your character will be able to blow away any encounters which rely on abilities. Not roleplay, or skills, but CR encounters. Anything with a 30 in Dexterity at level 1 that focuses on ranged combat will be almost unable to miss, and anything which does 2d6 damage (+2d6) will destroy any 1st level Orc Warrior, for instance, will barely a glance, much less 20-25% of the character (or, parties) resources. How many CR1 encounters can hit a 31AC? I don't know many at all, though I suppose dither can always be really lucky.
Ultimately, my character could be in no way as effective as your own in any part of the game, as encounters would end before melee actually occured. This is not my actual problem, as I understand my character is slightly unoptimized. It comes down to the fact that my misgivings would be added to a larger pile which contains most of the players in the game.
Despite your defenses, the fact that others have a problem with it means that they are not expecting a game in which 4d6 damage at level 1 was to be required. I would recommend that you stagger the stats you gain, and, if nothing else, increase the LA of Wendigo, since you are basically getting everything you wanted from the template (and losing some stuff you didn't actually want, along with some other stuff which you did, but for the gains...)
Ultimately, dither probably deserves a break. I, for one, would never attempt the task of converting Diablo into any semblance of roleplay. EVER.