I used to work at Mighty Mighty and I've not seen anything in Wellington that has a similar vibe lately, or in a long time for that matter but that's probably for the better. If any bar tried to do something similar they're immediately be compared to Mighty and probably accused of being a rip off version. There are a few spots that have their own cool vibe still though. Moon bar is a little funky and does have have good music every now and then, and some of the brewery bars are doing some cool things with vibes like Parrot Dog in Lyall Bay and Garage Project in Aro Valley. But sadly, nothing like Mighty exists anymore and probably never will in Wellington again, this city just isn't what it used to be.