In my experience, 14 is a pretty average AC.
Here are some preliminary numbers that I will leave you with while I go do my schoolwork.
Odds of critting:
Roll one dice, crit on a 20: 5%
Roll one dice, crit on a 19: 10%
Roll two dice, crit on a 20: 9.5%
Two dice, crit on a 19: 19%
Three dice, crit on a 20: 14.26%
Three dice, crit on a 19: 27%
With Elven accuracy, Advantage, and a +7 bonus to hit (+3 proficiency and +4 stat) we have a 97.3% chance to hit AC 14.
Half-elf Sorcerer(2)/Warlock(3) (using EB+ quickened EB) using Hexblade’s Curse on a single target
Odds of crit: 27%
Crit damage: 2d10+7 = 18
Odds of hit (and not crit): 70%
Normal Damage: 1d10+7 = 12.5
DPR (per blast) = 18*0.27 + 12*0.7 = 5.94+9.1 = 13.61
DPR (four blasts) = 54.44
Same calculations, this time without Hexblade curse:
Odds of crit: 14.26%
Crit damage: 2d10+4 = 15
Odds of hit (and not crit): 83.04%
Normal Damage: 1d10+4 =9.5
DPR(per blast)= 2.139+7.8 = 9.939