I love drive-in's! They're a dying breed, so I'm happy we have this option in Vegas.
PROS: being in the comfort of my own car (so I can kick off my shoes and wear my PJ's), bringing in all the junk food I love and can handle, and being able to talk (or scream if it's a scary movie) throughout the movie without embarrassment or shame.
CONS: it's across the street from Fiesta Station; I think the casino is too brightly lit so that it makes the screens hard to see sometimes. But whatever, it's $6.50 per person and I'm in my pajamas, so I can't complain too much.
I used to go to the drive-in all the time with my family when I was a kid, and it brings back so many good memories. I wish it wasn't so far of a drive (25 minutes or so), or else I'd be there every weekend.