If I have any quibble it is that there is a bit of a hole in the plot regarding the explanation for the absence of the driver of the first stagecoach to arrive at Minnie's Haberdashery. Considering how tightly plotted the rest of it is, with all loose ends tied up by the end (however implausible the tieing up), that does stick out a bit. And if I had a second quibble it would be that for bounty hunters the Major and Ruth seem remarkably ill-informed about people who might have a bounty on their heads. Minor issues though, that don't stop me recommending it to all but the squeamish.
One of Tarantino's trademarks is playing homage to other films and there have been a number of suggested influences bandied about, most notably 'The Thing', which I've never seen and therefore can't comment about, plus the television shows 'Bonanza' and 'The High Chaparral'. I'd like to offer another: 'Calamity Jane'. Fewer songs and more blood perhaps, but I defy you to watch the film and tell me that I'm not right.