I can see why it's annoying, I can see why people don't like the little changes that BioWare has made. But I do get the levels of rage that going on.
I like DLC and day 1 DLC to an extent, I don't think it's the death of gaming and what have you. I like getting the DD edition and having a little something extra I've paid for. I also like having the option to get the little something extra if I can't get hold of the full package in the first place (like if I was to try and get a CE or N7 version on a console now). I would be MORE annoyed, in fact, way more annoyed if I was completely unable to get this this bonus character unless I got a DD, CE or N7 version, and, to be honest everyone else probably would be too, especially console gamers who don't have the DD choice.
As for the DLC character being Prothean, in what BioWare game has a DLC character made any real impact? DA:O, Shale, nope. ME2, Zaeed & Kasumi, hell no! DA2? Sebastian, nope and pretty much everyone prefers Varric for the partys archer. The Prothean WILL not make an impact beyond his bonus missions, the Prothen is simply a publicity stunt.