Now, we all know how the grunts look relitively the same as the halo3 ones. Same for Elites. However, you go melee a brute’s helmet off, and what is that Thing. They don’t even look close to their former appearances. They’re all bald and ugly (not that they already weren’t, but they got worse!) Did the Covenant issue a new order at the time to make their whole army go bald? What do you think about this?
Redesign? Or the fact that is a prequel? I don’t know, I don’t care. 
New game, new look. Every game makes them look even tougher than they were before. Also more unintelligent. Brutes weren’t genuses in halo 2 and halo 3 but in reach they’re so stupid. All you have to do is stand behind a plasma coil in firefight or campaign and they’ll attempt to swat it out of their way.