He lacks a lot to me, as an MC he has a lot of room for improvement, his delivery can be off sometimes. At times his voice and vocal presence is lacking too.
I think he lacks lyrical potency at times and consistency. I don't think of him as solid, I think he can be too conformative and also pseudo intellectual and pseudo complex with his lyrics and content at time, like someone said a college student instead of a full blown master. I think he gets gassed up by some of his stans that want to sound intelligent but when you deal with someone who actually breaks the ish down some of it is wack and extremely remedial. Being abstract is a style but within that style you have to be potent with the delivery, flow and lyrics to make it work. That's some of the things he lacks to me.
Also in terms of discography I think he's lacking great albums, replay value, songwriting, he's lacking a lot in many areas.
That being said he has some good songs and he can be a good lyricist and MC on his day but to me that day is too irregular for me to rank him that highly, not a fan of the path he's been on recently either, even though some people shytted on Lasers and understandably so in some regards it had a few songs that were really dope and if Lupe had a similar lane to the pinnacle of the material on there regularly I could rank him higher. I still hope he releases some solid more solid material and fulfills the potential he has, but I do fear for the path he's on because it's limited and getting gassed by a small hardcore fan base I don't think overall will help him, it will feed them but Lupe was a big artist at 1 point and a lot of people liked the ish on his 1st 2 albums so many people know him, he seems to be alienating those fans in some ways and creating for a small core fan base who like puzzle raps and going on Rap Genius to read about obscure references. I think there's a balance that can be achieved, infact I know there is, where he could satisfy both, I hope he does it, we'll see. Am willing to listen...