User blog comment:Kaloneous/Mass Effect 3 Ending DLC Denied and PAX/@comment-4948356-20120510160946/@comment-3130611-20120511154952

I also saw similarities. The turians seemed kinda similar to the Elites, and the krogan had the same nature as Brutes. Plus the Covenant's weaponry looks kinda similar to geth pulse weaponry. And they both have the whole ancient race that destroys everything (the Flood, the Reapers) and a huge superweapon to deal with it (the Halo Rings, the Crucible) that were built by an ancient civilization (the Forerunners, the Protheans) that was wiped out by said ancient destroying race while they worked to save the rest of the developing galaxy. Also, there was only one sentient race in the time of the Forerunners and Protheans (and in both cases their routine combat tactics were their downfall), and "modern" times feature several types of sentient species.

I could kinda see a full-on fanon theory based on similarities between Halo and Mass Effect.