Fighter AC 20 Rogue AC 17. Kobold minion does 3.9% of the fighter's HP per swing & 6.9% of the rogue's. Add in the fighter's extra surges & you see why you don't want Rogues to be taking flack.
What is your party size?
Can you provide examples of a fight or two (as in what monsters did you fight)
And what is the length of your sessions?
5 Party Members: fighter, Paladin, Wizards, Rogue and Warlock.
I don't have the monster manual but we fought some bandit skirmishers and a warlock last game.
3-4 hours.
Curious: People complaining about monster hit points:
Then to reverse things - are you similarly dissatisfied with the damage output of monsters and feel they should do damage more quickly?
5 Party Members: fighter, Paladin, Wizards, Rogue and Warlock.
I don't have the monster manual but we fought some bandit skirmishers and a warlock last game.
3-4 hours.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.