I also think his mexican work is uneven, but consider "Gran Casino" (1947) a highlight. I saw it from a pristine print, and it was an incredible experience. One of his films that left me completely satisfied after the screening, and also a personal favorite. Where have you seen it arsaib? I thought it was quite difficult to come by. 
Damn, I should finalize my viewing log for February, but I forgot to write down the movies i watched after the Berlinale, and now I can't figure them out anymore. 

@R6dw6C 
You forgot to rate Makavejev's "Mysteries of the Organism".