I think Pac fans tend to have a different definition of "lyrical skills." Not to shit on anyone's opinion, but the majority of the songs that have been listed aren't really lyrical at all from a hip-hop standpoint. Regardless, here are some songs that I think Pac showed some lyrical skills in:
First 2 Bomb comes to mind (one of the few I agree with that has been mentioned)
"Tell me, baby what's your frequency?
I see you making proposals full of verbal indecencies when you're meeting me"
"Holding my position, my competition is never ready
Ripped like a machete, my alias Makaveli"
"Create rhymes that's so ferocious that the bassline
Runs from my vocals everytime a nigga say his rhymes"
"Tell me, nigga, how much you can handle?
Banging on wax, I turn this track into a Roman Candle"
"First to bomb, first is the calm, then the panic
Soon as my niggas break, we earthquake the whole planet"
"Live-long committed, I write songs and spit it"
Other songs that come to mind:
Don't Sleep
Don't Stop
When Thugz Cry (a lot more descriptive than he normally was in this one, especially in the first verse)
Fuckin wit the Wrong Nigga (the first verse is definitely one of Pac's more lyrical verses)