Oh yes we are! Look at his albums, some were sooooo shitty, they were good but would expect much more from him. His last two solo albums were meh, while Distant Relatives was monstruous, Illmatic, It was Written and I am were really good, Nastradamus, Stillmatic were meh, good but not Nas good.
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Maybe it's just me, I expect a lot from Nas and everytime I listen to his verses/songs I expect it to be really really good, sometimes he dissapoints simply because he set the bar extremely high for himself.