I don't think it's better to watch the trilogy, Fistful and Few More are not nearly as good.
Good, Bad, Ugly is incredible. I watched it pretty much expecting I won't like it actually, but it was amazing. Cinematography/Photography is incredible. Score I don't think needs word, Ecstasy of Gold is probably the most memorable piece in cinema history. Story ain't really that important as it is mostly character driver, you got these three no-gooders at each other necks, and all 3 of the are so hard-boiled, and it's the gist of it. Eastwood and Wallach kill it. It both defies the genre (at least what was seen as quintessential western at times, John Ford / John Wayne Noble Loner Hero style) and defines it at the same time, as later it became the quintessential western. There's no moral highground, it's just Wild West all the way. I seriously don't know how somebody can NOT like it.
Earlier this week I saw Deadpool (which disappointed at first, but got back on track, was pretty much as I expected it), and saw Carnage tonight, which was cool but it is very obvious at being an adapted play and as such has some problems with the big screen format.
Actually trying to get to 100 this year, January was fine (10), February not so (only 2 so far).. need to catch up!