Yeah, one of the things I really like about Halo is the general art design to the environments, and you lose almost all of that in Forge. I love being in Sanctuary, the dry side, the mossy side with the streams of water and puddles, the drip coming from the ceiling on one of the bases.
You go into Asylum and it's just a plot of grass with grey blocks on it.
And then there's the MLG Sanctuary aesthetics...