Both Jack and Meg take their somewhat limited skills and make something great out of them. In my opinion, I think that's far more impressive than an amazingly technical and speedy group of musicians playing scales.
On my favourite debut album(s), I'd have to say that it's a huge tie between these fellows.
Captain Beefheart and His Magic Band - Safe As Milk
This is my favourite blues album, it captures Vliet and the other bandmates (with the inclusion of Ry Cooder) at a time before they went off of the cliff into avant-gardism, and it also serves as a good eye-opener to Beefheartedness when introducing people to his works. Not my favourite flavour of beef, but this album still gets a 10/10.
Zu - Bromio
Dericulous album cover, brilliant album. This album is more brass heavy than their other works, but being the amazing band that they are, they make it work. I love everything that these guys have done, and this album is no exception.
Mr. Bungle - Mr. Bungle
Hell, what hasn't been said about this album? Much more ska and metal oriented than their better works (Disco Volante) and it's another eye-opener to Pattonism like Milk is an eye-opener to Beefland.
miRthkon - Vehicle
Jesus, this album is brilliant. It's miRthkon's only release, unfortunately, but it blows my socks off every time that I listen to it. This one goes up there with the greats of jazz/rock/avant-garde/(insert genre here)/fusion/brilliance.
Jandek's Ready for the House, the VU and Nico, and AMMMusic 1966 all get honorable mention as well.