There has been so much written about QT over the last 20 years that it's beyond the time constraints of reality to try to process it all. People got so butthurt about his movies for the first 10 years of his career because they more shamelessly cited their influences than was normal at that time. Then the next ten years we had to decide whether it was okay to say the N word and show women getting beaten up.
I guess we could go through them one at a time, but it's pretty fair to say that every one of his films apart from Jackie Brown depict pretty horrific violence throughout, so yeah, there will be some violence in the last 30 minutes. But then again, QT works in genre, primarily crime drama, and most crime dramas will include "bloodbaths" at some point or another, so to say there's violence in the last 30 minutes is a pretty easy criticism.
The fairest way to judge him as a filmmaker imo is to simply look at each of his movies and see whether you enjoy them on their own. Even if they each followed a pretty strict pattern, if I enjoyed each of them when I watched them, they are successful films imo.
For me, half his films get perfect scores, Death Proof is probably a 4.5/5, Hateful Eight is probably a 4/5 and the Kill Bills get 4/5 and 3.5/5, respectively. That is a pretty damn solid record. Probably only rivaled among contemporary filmmakers (at least those with significant numbers of films under their belts) by Scorsese, the Coen brothers, Alexander Payne and maybe Terrence Malick. Each of those directors have made movies (some more than one) that rival Tarantino's best, but their strength - like QT imo - is in their reliability.
Is he one of the most inventive or original filmmakers of all time? In a way, but his power is in his style and I guess that's something you either like or don't.