Why 'The Hateful Eight' lacks the Tarantino shock-factor

What is problematic with Tarantino’s latest film, The Hateful Eight, is that it doesn’t do anything we haven’t seen from Tarantino before. Operating like a wild-western, elaborated version of Reservoir Dogs, what starts out as a darkly-humorous and well-directed film ends in a bloodbath which curdles the stomach.
The monotonic wait for the violent death of each character is mediated by some brilliant acting of course, from the likes of Tarantino’s favourites Samuel L. Jackson and Tim Roth, alongside Kurt Russell and Jennifer Jason Leigh yet The Hateful Eight's plot never seems to take its viewers to new territory.
The film is also beset by questions of whether it deals with some of its content appropriately.
Aside from her heavy redneck accent, smug grimaces and evil criminality, what makes Jason Leigh’s character Daisy Domergue so entertaining is her constant mistreatment, beginning with her being violently punched in the face and then knocked out of a moving carriage in the films opening chapter. The fact that Daisy's abuse, which is used for the purpose of entertainment, lies unresolved throughout the film is discomforting.

Daisy Domergue, resembling Carrie.
Another issue which is never dealt with is that of racism. Whilst Samuel L. Jackson’s Major Marquis Warren is surrounded by the prejudice of the other characters, his revenge is geared up for the purpose of sensationalism rather than to make any political statements. He may (according to his anecdote) force The Confederate's son to give him oral pleasure whilst naked in sub-zero temperature, but this seems to lack any proper sense of justice, and the deaths of other minor black characters are equally abrupt and dealt with without sentiment or statement in the film.
 Furthermore, Tarantino’s ploy of using characteristically mainstream actors in his films, e.g. Bruce Willis and John Travolta in Pulp Fiction - which often requires some seriously good acting - fails in this film. The gimmick of using Channing Tatum as Domergue’s vigilante brother is almost expected, and his acting fails to ever charm viewer’s given that within a short space of time Tatum’s head is blown off.

All in all, whilst a viewer who is unaware of Tarantino’s previous films might be swayed into thinking they have watched something new and exciting, anyone who has will be left after the nearly three hours running time with a numb bum, a knot in their stomach from all the gore, still waiting to be shocked.