I mean I was playing Combat Evolved and the actual number of enemies didn’t feel all that different. It was simply that:
-
Weapons feel a lot more powerful. Simply
gong through a few grunts and elites took a fair bit of killing with grenades, cover and lots of assault rifle fire. Now you can easily down the same number of enemies in a single round of BR fire. -
In a lot of Halo missions you are quite simply walking or driving in an empty space with no action. In some missions like Control Room or Halo this is actually quite a substantial amount of time. Halo 4 and 5 actively avoid this with combats rolling one after the other. Maps are often well designed but small and easy to cross.
-
Overuse of weak enemy types is also a major issue. Making the bulk of your opponents one shot and slow moving crawlers and grunts makes combat very easy. Halo 5 gets a lot harder when they start adding turrets, snipers, hunters and the warden but these are too infrequent. The game doesn’t create challenging combats like in previous Halo.
4 Theres also a lot less “hold this ground against waves of enemies” or backtracking to extend the length of the mission without adding more sections.
5 The revive system makes the game wayyy easier. You probably would have added do a lot of time to my playthrough with that disabled. Dying should send you back to a checkpoint and punish you for failing so you lose your work. This could be punishing in previous Halo titles.