A wannabe upscale "pick-up" place, that's what the Qbar has turned into over the years...That's not entirely their fault : The BKK night scene is dull (This is an euphemism), the Thai professionals don't go out much during the week and don't want to mingle with the foreign mongers, and many other local factors...You end up with a very limited quality places on offer for a city of that size. Still Qbar carries a better selection of spirits than most places, hosts from time to time great DJ's and can be a OK chill lounge. But what a headache to be surrounded by dozens of pretty agressive hookers (Who very often pretend to be something else...). Don't bring your wife/GF there, you'll both feel out of place.
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