Well, I'd rate it as "nearly flawless". It's undoubtedly comparable to Kempff, Brendel, Arrau etc. in my opinion.
Kempff and Brendel are considered the upper echelon of Beethoven performers? When listening to the Pastoral I disliked both of them. Too slow.
I have Richard Goode's complete set of Beethoven's Piano Sonatas. Sounds great to me! I think I might like Barenboim a little better, though. But only a little.