FrogReaver
The most respectful and polite poster ever
Everything sounds boring when you take all nuance away and just say it's an I do 'X' more or I do "Y' better mechanic (which virtually everything fits into).Action surge is absolutely the most boring possible mechanic to increase the power of a class. It's just, "I attack more". That's why I'm cool with the Level Up fighter, which ditches action surge in favor of a huge passel of other stuff.
Wizard gains spells - it's boring cause it's just 'i cast more'
Rogue gains expertise - it's boring cause it's just 'i skill better'
I'm not saying action surge is the only possible mechanic for a fighter, but it's a solid and fun one IMO. I've never once seen it be boring in actual play and it's quite impactful.