For individual guys wanting to get a push, mic skills matter more in the WWE because the company is one dedicated to drama and storylines.
For casuals, they don't tend to care as long as they managed to be entertained one way or another; most casuals derive near equal enjoyment from both.
On an related note, you have to actually hide a guy's shitty in-ring skill through attentive booking of the guy's matches (Hogan rarely wrestling, Goldberg/Warrior mainly wrestling in squash matches, having Jeff jump off of ****, being placed with guys who can carry the wrestling side) regardless of how charismatic said performer is while performers the audience likes can be completely forgiven by the casuals for being downright bad on the mic. Bad promos will be overlooked if casuals like you enough, bad matches will rarely be so easily forgiven regardless of who you are (unless it can be blamed on your opponents like with Undertaker).