The thing is there isn't any major bomb like that in Halo 4. And even in other series of games, such as COD, teamwork is still the best way to play. Teamwork doesn't always mean running around together in a pack. You can be spread out throughout the map and still work in unison. I know a lot of times in Big Team Battle my group of friends and I are rarely running side by side. But we communicate and can attack the same group of enemy from multiple directions and take them down. Or we'll call out power weapons as they spawn, call out vehicles that are up and running, and share ordinances as needed.
Now the player I originally quoted was more frustrated with people running together. That horde type mentality is a great strategy for smaller maps. However it does fail when it comes to a larger map with more powerful weapons and vehicles. I.E running around in a pack on Ragnarok could get your whole team killed off pretty fast by a Mantis, Banshee, or something similar.