OK, let me preface this by saying that this is going to have to be a review of the DVD, not the TV show itself.
I am such a insanely huge fan of Metalocalypse that I could not possibly be objective about the content of the show.
I watched every episode of this brutality when it aired on [adult swim], I bought the Deluxe Edition CD AND the Vinyl, the Season 1 DVD; I even saw them play "live" at the Chicago HoB this past Summer.
To say that I am a "fan" would, in fact, be a huge fucking understatement.

If you want to know more about the actual SHOW check out these links.

So...lets get down to it:
Picture:
Metalocalypse is produced using Flash animation, so animation is fairly detailed but movement is somewhat limited.
I love how extra care is taken to ensure that the hand movements are accurate during songs. Show creator Brandon Small (also the creator of Home Movies) insisted upon it and it shows.
One of my biggest gripes about Season 1 was the 4:3 letterbox format. Those of us with 16:9 TVs were stuck with an image that had a border all the way around the screen. That sucked (sorry, it's a pet peeve of mine, it drives me nuts...I'm looking at you End of Evangelion).
This time we are treated to a full 16:9 presentation, and it is sweet.

VERDICT: 3.5/5 Considering that it's Flash animation, it looks amazing and is in the right format (this time...damn season 1 DVD). However, Flash animation allows for poor movement and (in my opinion) is not suitable for TV and Movies; looks fine on those there interwebs, but not on my TV.

Audio:
2.0 stereo....kinda basic considering that this is a music based TV show.
I admit, if you are only using your TV or computer speakers, it'll sound about as good as anything can (ie: awesome).
BUT, an alternate 5.1 track would have been much appreciated by...well...anyone with a sound system.
A show like this just begs to have a 5.1 DTS surround sound track , but no. We are left in the cold with no high quality audio options to warm our fragile ears.

VERDICT: 3/5 Once again, while the audio sounds really good; you'd think that a show made for (and by) music lovers would cater to us with with at least some kind of high quality audio option.

Extras:
Well...dammit.
No commentary.
This is the kind of show that thrives on obscure musical references, in-show easter eggs, and self-referential humor, just screams for...hell, NEEDS a commentary track.
Sorry, no excuse for that.

There are 2 deleted scenes; both ok, but you understand why they were excised after watching them.

Two music videos are included (one for Mermaid-er, and the other for Bloodrocuted.)
Bloodrocuted is readily available on the web and even got limited play on MTV2, so it's not a huge deal that it was included here.
Mermaid-er (which, as Murderface pointed out, is about Mermaid murder), on the other hand, was only previously seen by those of us who saw the tour. This video is particularly brutal and should not be viewed by children.

The rest of the extras, which largely consists of the characters finding excuses to talk (ie: lead singer Nathan Explosion reading Shakespeare) will only be enjoyed by rabid fans of the show.

VERDICT: 3/5 for fans, 1.5/5 for everyone else.
Also, with no actual "Extra Features Menu," ALL extras are hidden as easter eggs on the main menu.
while this is certainly brutal, it is not especially user friendly.


FINAL VERDICT: 3/5 (not an average)

If you are already a fan of the show you MUST buy this simply because you need the episodes, but you may be disappointed by the quality of the extras.
If you don't know the show, go get season 1 first. Season 2 is great, but you need season 1 to provide context.

Cheers. And have an extremely zazzy day.