Well he's right. Macs album was one of the best of the year. He's in a good spot musically, just chilling in his mansion smoked out making the kind of shyt he thinks sounds good. He's a mediocre emcee but he seems to at least know his hip hop enough, at least relative to other contemporary artists.
I agree with this and this is why I like Mac Miller.
Is he my favorite rapper? No but he has a little lane for himself and he really show he's studied the culture and art form and that he truly does respect it. You can hear this in his music with his flows, production, lyrics, etc. He's not the best rapper out but he makes decent enough hip hop music to bump. His last album was pretty good and he had one of the best verses of the year last year IMO on his verse on Earl Sweatshirt's track Guild from his Doris album (which was pretty weak IMO).
Said this a hit of liquid heroin
Marilyn Manson channeling, panicking, spar with Anakin

'Til one of us leave in an ambulance
Blow the smoke of the spliff in your eyes
You ain't gon' live till you die
Intelligent b1tch on my side
She b1tching, I'm spitting habitual lies 
I hit her up when my jet land
Got a swisher tucked in my headband
Front page news, I'm young Jesus
Eating bagels with no cable on,
Been fuking hoes since when Mase was on, 
I hope that Basedgod hears my prayers
One day you're here, the next day you're gone
So me and Earl smoking weed on Jay-Z's lawn 
Some dope rap on your ho azz, Tony Womack
Don't hold back, or feed your girl Cognac,
Meet a bytch, sleepin' with her, feverish, keep a chick,
Met her off Twitter even Schindler keeps a list, 
Pittsburgh, broke down somewhere in a Fisker
I could pull your b1tch with a whisper and diss her,
Dumbass ho
She only dumb cause she love that though
Somewhere getting high reading, Juxtapoz
I hit her up, she come through and watch Adjustment Bureau
Moms love me cause I'm so commercial
I fukk 'em raw cause I know they fertile 
In Myrtle Beach with a purple fleece
Hotel lobbies playing Fur Elise
I'm Ron Burgundy mixed with Hercules
Slap a b1tch in the mouth if she curse at me 
I said Josh's beard is like Paul Revere
When he walk in the room it's like God is here
I'm at a prop shop in Montauk throwing tomahawks
At civilians... I'm chillin'
His flow, mixed with the references and the way he rode the beat on this showed his ability to spit and some of the lyricism he displays. Especially on a darker track like this. It was a very fitting verse that impressed me from dude.