I think it's intentional that some classes crit harder then others.But then why don't we double the modifier also? The damage modifiers in 5E are really reigned in; on low level monsters, it's like +1 or +2 usually, but we also have low level monsters like Hobgoblins which can deal an extra 2d8 damage in certain cases.
By not doubling the modifier, which aren't out of control in this edition, certain classes are hurt more than others. It just seems kind of odd.
I saw this suggested a while back, possibly by you. We've been doing the same thing for about two months. Before we did so, I cautioned the players that it applied to all crits, not just theirs.We houserule it; max damage plus the extra die. This way you never get a critical hit that does less than max damage +1.
Nothing worse than getting a crit and then rolling two dice and seeing a pair of snake-eyes.
I saw this suggested a while back, possibly by you. We've been doing the same thing for about two months. Before we did so, I cautioned the players that it applied to all crits, not just theirs.
The first three crits were from monsters, not PCs. To their credit, the players did not back down. This rule guarantees a bit a sphincter pucker anytime a crit comes up against the PCs. It also guarantees a bit of a cheer anytime the PCs score one.
Last session, my dice we really, really hot. The wizard cast blur and haste on the Fighter and sent her into a crowd of mooks. The disadvantage imposed by the blur saved her from 7 crits in the first two rounds of combat, alone. Considering the Fighter is played by my wife, it probably also saved me from a night on the couch.