Why don't I like Westerns?

I've seen a lot of of the quintessential westerns by now, but they still seem to consistently fail to engage me:

The Good, the Bad and the Ugly had a great climax and soundtrack, but otherwise didn't do much for me, Once Upon a Time in the West I can barely recall anything about it (although I do plan to rewatch this anyway), and The Searchers for me was one of the most obnoxious films I've ever had to sit through, partially because I couldn't stand John Wayne.

I've also seen The Wild Bunch and Unforgiven, but still none of them have left much of an impression.

It's annoying because on paper, the Western genre sounds like the kind of thing I should like, and it seems a shame that I don't get the enjoyment out of these classics that everyone else seems to. To date the only one I have genuinely liked from start to finish was Django Unchained, mainly due to Tarantino's trademark style shaking things up a bit.

So, have I just got an aversion to Westerns, or have I just started with the wrong ones? Or do I just need to give them all a second chance to really get into them? And for someone like me trying to get into the genre, what films would you recommend to start with?