Same. I was having this conversation with someone the other day - that there's not a single film of Brad Pitt's I've seen that I didnt like. And that he's been brilliant in all of them. Yes he's very high profile but yes he doesn't get the plaudits like others - and possibly for reasons you say.
Snatch, 12 monkeys, Fight Club, Legends of the Fall, Inglorious Basterds, Seven, The Departed, Moneyball, World War Z, Oceans Eleven, 12 Years a Slave, Fury.... not all his films there but that's a pretty damn impressive CV right there.. (well at least I loved all these...).
Pitt even had a cameo on Being John Malkovich - my 2nd favourite film of all time.... (looking forward to the LU all time favourite movie results...).
Another Under-rated actor I suggest..
Daniel Bruhl - played Niki Lauda in Rush - awesome performance, amongst a few other films of his I've seen (inc Inglorious Basterds). He's been brilliant in all.
https://en.wikipedia.org/wiki/Daniel_Brühl