I see where you're coming from, but I don't think it's reasonable to compare 90 minutes of Mass Effect to 90 minutes of R-Type III (or something).  We're talking about a game that has 40+ hours of gameplay to begin with; to add 90 minutes on to that is much less exceptional when taking this into account.  And like Twesterm says, will it really be different enough to warrant a purchase?  Why not just go and play through one of the main missions again?

However, I'm not saying it definitely won't be worth it, or that I won't buy it.  Just that I'll wait to see some impressions on the final product before deciding to purchase.

The big question is what KIND of content we're getting.

Is this a new solar system? With what kind of planet?

It wont be a very good deal if it's one of those generic randomized worlds, with a fetch & kill quest.

However, if we're talking a planet with the content level near something like.......Ferros or Noveria, it'd be a great deal.

 *edit* I see Batarians. 2 of them, actually. This is most welcome. Its good to see that the DLC will actually add to the world and lore of ME, and not just add on to pre-existing ideals. Hopefully this asteroid station is large. Mako-sized or not, it could be interesting. At 90 minutes, I'd assume it's not just a simple quest inside one of the 4-ish pre-done buildings.

At $5, this is day-1. Anyone else notice it'll rack in 50GS? That would make me assume they're planning bigger, better content down the road.

Yeah, an extra mission like Feros or Noveria ... actually - two solar systems seems about right.

Let me talk to my sources ... 

Here's the backstory ...

The Epic Journey Continues with the Release of the First Downloadable Content for the Sci-Fi Blockbuster "Mass Effect"
LONDON - 6th February 2008 - To date, over 1.6 million gamers have explored the engaging sci-fi universe of "Mass Effect." Beginning on 10th March, fans everywhere will be able to expand the "Mass Effect" experience with the release of the first ever downloadable content for the award-winning saga.
The "Bring Down the Sky" downloadable content pack will be released to Xbox LIVE Marketplace on Monday, 10th March at 10am, and will be available for 400 MS points. This is the first in a series of planned downloadable content that further expands the "Mass Effect" universe and continues the adventures of Commander Shepard and his crew of the Normandy.
"Bring Down the Sky" includes a new uncharted world that introduces the notorious and feared alien race of the Batarians. A Batarian extremist group has hijacked a mobile asteroid station in the Asgard system, setting it on a collision course with the nearby colony world of Terra Nova. Only Commander Shepard can save the millions of innocent civilians before the asteroid completes its deadly descent.

"Bring Down the Sky" contains approximately 90 minutes of heart-pounding action and a new Achievement worth 50 Gamerscore points.

"Mass Effect" is exclusively available on Xbox 360.

i love this game, but i think i'll wait until my friend dl it before i get it (or don't). I still have to go back and beat it on renegade mode.

I think I'll wait for the second game, unless it's really good.

Well I enjoyed this game and $5 really isn`t too bad even if it is only 90 minutes of gameplay. So I`ll probably get it down the track.

Yeah, sounds great.
I will be buying it for sure. I wouldn't mind if new DLC planets opened up that did not offer much for game play, but were free.

They should just keep expanding the Universe.

The game makes me want a version of Mass Effect that is an MMORPG.
Yeah an MMORPG Mass Effect would be incredible.

I'll gladly pay a measly $5 for this DLC...I hope Bioware can drip feed the content every couple of months or so until Mass Effect 2 drops...

Sounds like excellent news to me, I'll be sure to get it.