The longest winning streak.

[General Lee]

Autopsy, all the way from Severed up to Shitfun, including all the EPs

[Carnage]

I'd have said the reunion run, from The Tomb Within EP to Ashes..., about 10 releases between albums and EPs.

[Yung Led Zeppelin]

Definitely Yob. What a fucking band.

[Carnage]

Electric Wizard from the debut to Witchcult Today, 6 albums (plus 2 EPs). Fell off a cliff after that IMO but before that they're all gold.

[koper]

There is a good case to be made for
Autopsy. Especially considering their influence on Scandinavian DM and BM (see: Darkthrone).

[Black Shepherd Carnage]

Dodheimsgard for 7 (6 albums + 1 EP).

[Black Shepherd Carnage]

Any streak over 5 that is also a full discography should get bonus points 

[ochoill]

Any streak over 5 that is also a full discography should get bonus points 

It's like using your full hand in scrabble.

[Black Shepherd Carnage]

Fisting the Pouch of Tiles   

Oh wait, I see what you mean.

[Carnage]

Godflesh are another one that comes to mind. I know Us And Them and Hymns aren't thought of as their best but I think they're mighty, and their reunion era material is all decent too.

10 albums (I'm including the debut EP in that, it's a fair oul' length), add the EPs and it's a good ol' streak.

[Mooncat]

ACDC - 5 in a row

Let There Be Rock (1977)
Powerage (1978)
Highway to Hell (1979)
Back in Black (1980)
For Those About to Rock We Salute You (1981)

You wouldn't put the first two in? They're two of my favourites. First is a classic and Dirty Deeds is underrated.

[Black Shepherd Carnage]

Pink Floyd would get a 7 from me too: Atom Heart Mother to The Wall. And in the space of only 9 years.

[Carnage]

I'd cut The Wall from that myself but I'd take the other 6.

[The Heretic]

ACDC - 5 in a row

Let There Be Rock (1977)
Powerage (1978)
Highway to Hell (1979)
Back in Black (1980)
For Those About to Rock We Salute You (1981)

You wouldn't put the first two in? They're two of my favourites. First is a classic and Dirty Deeds is underrated.

I think the first 2 have some filler songs, however both contain some classic ACDC songs that's for sure

[Trev]

I don't think Blind Guardian have ever done a bad album, but in terms of a streak I'd go their debut up to Night at the Opera for a seven album run