Let me preface my comments by saying that I've never heard of Alex Da Kid other than love the way you lie or Skylar Grey before hearing I Need A Doctor (that I know of). So my personal exposure to both of them is very limited. I didn't care for I Need A Doctor. I don't think the production of the beat fit the tone of the lyrics, and thus made a mediocre song.
If you're a Lupe fan, the content and subject matter coming from him isn't unfamiliar to you, and are probably surprised that Lu isn't putting on a show of lyrical acrobatics on this song. Listening to the song as a complete piece of work, this isn't about flipping metaphors and similes, nor are that facet of Lupe's lyrical ability needed for this song.
This is a message to the people, and the beat and hook fit that message perfectly. The hook accentuates Lupe's lyrics, while the beat provide a mesmerizing, but not overtly dominant thump and pace in which the lyrics can be delivered forcefully and efficiently sans wizardry that we all know Lupe is known for.
For those uninitiated to Lupe outside of his radio singles, from the first 8 bars you know this is definitely NOT a radio/media friendly song, and it may catch you off guard. He speaks on current issues and offers a counter and criticism of the media's portrayal of the issues; Beck and Limbaugh being called out for what they are, taking shots at Pres. Obama for an impotent middle east policy, while countering right wing media's depiction of what Islam is in a post 9/11 culture.
Lupe's darts aren't all reserved for corrupt education policies and banks and the war machine economy or other social issues, as he challenges his listeners to be more than armchair activists and revolutionaries ("Just listenin to Pac aint gon' make it stop/ A rebel in your thoughts aint gon make it hot..."). Further, the hook is a nice segue to the third verse, as Lupe opens with "I think that all the silence is worse than all the violence", highlighting and adding to the understanding of the hook and song title.