Watched it because my wife and I worked our way through all Best Picture winners to try to expose ourselves to movies we wouldn't otherwise watch as for the same reason as you, it's easy to have a bunch of movies in the cultural zeitgeist pass us by. Maybe that coloured my perception of it too as I was watching a lot of similar films around the same time, and watching it when it first came out may have left a different impression.
I’ve just flicked through the list of best picture winner, I’ve not heard of most of them

Ive seen a few, and those I have seen have been brilliant, with the exception of the hurt locker, which I thought was pretty good but that must have been a **** year for films if it won, definitely a level below the likes of LOTR, Gladiator, Braveheart. Oppenheimer is in my watch list although I think literally everyone I know who watched it said it was ****e. Can’t remember the last modern release I came away wowed from to be honest, Interstellar was heading that way until about 2/3 of the way in when it just got stupid.