Halo 2 > Halo 3 > Halo 3 ODST > Halo Reach > Halo CE
Based on campaigns.
Posted by: Sliding Ghost
Separatist Grunts didn't appear because there might have been confusion (yeah right, that's bs) and because H3 was all about dumbing down the story (cinematics robbed us of gameplay and there was poor execution robbing us of immersion: Pelicans that can shoot missiles at enemies behind them, Gravemind/Cortana moments, enemies being killed off in plain sight, weapons falling through the geometry).
Apparently, Bungie was dissatisfied about H2.
Anyways, this led to lackluster campaigns that could never come close to CE or H2 (ODST scratched the surface but didn't manage to reach it). You know why? Because they didn't dare.
Reach wasn't a big change contrary to popular belief. It has the core Halo, only it's been even more dumbed down.
Reach had big plans:
-global battles
-driving a Scarab
And all we get is bs:
-TotS massive tease
-long, unskippable cinematics that, you guessed it, rob us of gameplay
-standard linear room to room battles
I agree