Aesthetically I actually like CEA's work more than H2A, although visually it's a less direct recreation.
H2A seriously puts me off with the material appearance, although the specular is very expressive it's like many environments have a sort of dry pasty appearance. The shadow penumbra everywhere also looks sort of obnoxious and blobby, lighting environments are questionable with weirdly dark areas scattered about, there are lots of dynamic lights that are WAY bigger than they ought to be (the banshee projectiles being a particularly awful-looking standout), some effects work is bizarrely blinding, and several reflection effects have annoying temporal instabilities of varying sorts.
Some impressive tech going on, but I'm not a huge fan of how things were tuned.
Although I can understand why some people would like to punch up some of Halo 2's audio, H2A is an obnoxiously bangy soup that literally makes my head hurt sometimes.
The new cutscenes have impressive rendering work, but they're not aesthetically consistent with the real-time visuals. And the editing is poor, especially for audio integration (there are serious dialogue pacing errors, and things often just don't flow well with the soundtrack).