I somewhat agree with you. I don't find Barry Lyndon to be in the class of the three films you list. I think it's a good film--and a tour de force with respect to cinematography and general production design--but may of the criticisms leveled at it when it first came out still apply.
With regard to this movie, I simply don't know if I'm the innocent who cries out that the emperor is naked, or if I'm simply too incompetent and unfit to see it.
I personally enjoy Barry Lyndon overall--and this may well get me to watch it again--but I've been less inclined to re-view it than I have many other Kubrick films. (Honestly, I'm not really in a big hurry to rewatch 2001 either; it was also an impressive achievement when it came out but it shares the coldness and the very deliberate pacing of Barry Lyndon.)
I don't think it's at all irrational to say, meh, didn't enjoy it and don't want to see it again.
Just give him time. Grow as a human, get older, live your life. And then at some point of your life, watch his movies again. There's a good chance you'll get them.