[Updated: An update to Major Nelson's blog reports that Halo: Reach has beaten Modern Warfare 2 on Xbox Live every day since launch. Scroll down for the full update.]

Not so fast Halo: Reach. You've had a big debut, claiming that your Xbox Live presence surpassed Halo 3, and had the most concurrent users online - but you brushed over another fact.

While Halo: Reach was the top online game from the Halo franchise, Reach was unable to top Call of Duty Modern Warfare 2 for the week of September 13th through the 19th.

Though Reach was released on the 14th, and swiftly took the title of Biggest Entertainment Launch of 2010, Modern Warfare 2 was not going to let up its stranglehold on the Live market share. On his blog, Live guru Major Nelson was able to clear up the confusion listing MW2 as the number one Live game of that week. Since that posting, Reach has been number one on Live every day, so do not worry Reach gamers your dutiful play time has been noted.

The Reach numbers only contained six days of data, but the tight battle between the two mega-FPS franchises, hints at how popular the Call of Duty franchise has become.

Call of Duty Black Ops is just around the corner and it'll be interesting to see how the new FPS effects the massive numbers of Reach and Modern Warfare 2 - Black Ops’ online offerings are the most diverse yet. That said, don’t underestimate the power of Halo dominance on Xbox. Expect perhaps some downloadable content, very likely map packs, to help combat the inevitable onslaught of Black Ops. Some might find Reach to be a shallow pool with very little substance, but those millions and millions of gamers that have devoted 5,901 years worth of time to the game are certainly finding much to enjoy.

If both Reach and Modern Warfare 2 had been released around the same time, which would get the lion’s share of your attention on Xbox Live?

Update: As mentioned in the article, Modern Warfare 2 has beaten Halo: Reach for the week of September 13th through the 19th; however, a correction from Major Nelson suggests that Reach has beaten MW2 every day since release - with wide margins. We touched on the fact that these totals were calculated with 7 full days of Modern Warfare 2 and only 6 for Reach - the extra day was enough to put MW2 on top for the week, even though Reach has handily won each day since launch.

As a result, expect Reach to dominate the top of the charts for September 20th through the 26th.

Halo: Reach is available now for the Xbox 360.

Source: Major Nelson [Updated]