if we count halo 3 and its expansion odst vs modernwarfare 2 (ps3 and 360 version) then halo wins :). 2 vs 2. so i think reach is gonna sell 5.5-7.5 million first week 14 million + lifetime.

4.9 million in week one is impressive, but I don't think it's a sure thing that MW2 will take out Halo 3 as the top selller on the 360. Halo 3 took almost 2 years to get to 10 million, and it has been the king of the 360 in being able to do that. It is going to be close, but given that Halo Reach launches next year...it's going to eat into the long-term sales on MW@, not to mention that a new COD will launch next year...most likely.

I checked yesterday the numbers for MW1 for X360, it's almost 8m - Wow.

It's safe to assume that Reach will start with first week sales at about 7m mark. Halo is a giant, even ODST has great legs with 3 last weeks at 80k, Halo 3 every week 20-30k.

The reason the MW2 was able to sell 5 million on the 360 was because of the audience Halo 3 created. With that said, its very possible Reach can have a bigger opening.

Hopefully people don't see it as Another ODST and Skip it , other wise it should break records

Halo 3 on its launch week was bought by 1/4 of all 360 owners and in 2 years was bought by 1/3 of all 360 owners.
using this pattern:
Halo Reach first week - about 10-12mln
Halo Reach LT - 18-20mln
since by the time Halo reach will be released there will be about 44-48mln 360s on the market.

realistically Halo Reach could sell 7-8mln on its launch week and within a year could reach about 15-16mln copies.

I take it you're using "realistically" in a loose sense, waron? :D

Halo 3 in 2 years was bought by 30% of all 360 owners to date. i believe that Reach will do about the same(25-30% of all 360 owners in 2012).

What I find AMAZING is how many posters with NO X360 tag feeling that Halo is waning...lol...I'm curious as to what data points they are using, because it seems to me that Halo brand is as strong as ever!

do what mw2 did with cod 4 improve the formula? anyway halo is scifi and halo which equals regenerative shields , alien weaponry alien environements, urealistic jump hights etc... they cater to different crowds but at the same time similar crowds... point is it will have great sales and stuff xD but really its not a direct competitor like bf2 or other such games