Is it just me, or is Halo 1 just more epic in scale than it's two sequels?

[Reasonable]

Halo 1 had best SP & Halo 3 has best MP.

In many ways Halo has been about a journey from a primarily great SP FPS to a primarily great MP FPS.

As I personally prefer the SP element of a FPS to the MP this has lead to Halo becoming on minimal interest to me.

Given the huge success of this move though, and the fact that there is undeniably a huge market for the MP element of a FPS, I'm not expecting either of the upcoming Halo titles to change my views much.