Lets run through all the bosses, shall we...
Ruins of Mazzatun:
Boss 1: Does literally nothing except knock people down. Hardly even considered a boss.
Boss 2 (Chudan): Does not require high DPS, can be done with low DPS as long as you kill the archers, and they are very easy to kill. The dome spawns at 75/50/25% and killing the archers before it spawns instead of burning down the boss makes this fight easier.
Boss 3 (Zalnur): No DPS check at all, the boss doesn't have a large HP pool and actually spends most of the time in an undamageable state. Even the Archers here are handled by the lizards so you don't need to DPS them.
Boss 4 (final boss): This boss has a soft DPS check since the ads spawn on a timer. You need to kill them before the next wave spawns. On non-HM veteran the ads have laughable HP and if you made it this far you are capable of handling them. The totem is a bit of a DPS check but because it drains resources it generally makes any DPS rotations pretty obsolete.

Cradle of Shadows:
Boss 1: Forces you to run though darkness twice, can be DPSed as slowly as you want. The spiders go down to AoE.
Boss 2: Same thing as above.
Boss 3: Is a big spider. As long as you bash it, and know not to stand in red this boss does literally nothing.
Boss 4 (Vanos): High DPS helps skip the Fire-Rune-teleport phase which makes the fight easier. That said, this phase is not hard as long as the DPS know to bash. During the orange phase the tank should run and chain-kill the ads which makes this part require 0 DPS, the DPS can literally chill and watch them both run around the room.
Boss 5 (Velidreth): Hardmode is a soft DPS check since the ads spawning can overwhelm a weaker group. On non-HM veteran the ads are a joke. Avoiding the orbs simply requires practice but the fight can be done on 0 resources just heavy attacking. Navigating the catacombs is independent of DPS. Very High DPS is detrimental as it might mean you skip the atronach phase and most probably die in the catacombs.

The problem people have with SOTH is that people try to burn down bosses senselessly. It's simply better to respect the mechanics. People are not used to respecting mechanics because a group DPS of 40k is enough to skip most of vet mechanics in other dungeons.
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