There are a few night clubs in Roppongi worth visiting, like A-Life, Feria, and Muse, but overall the place is scary. I cannot walk down the street without being harassed by about a dozen Nigerian or African people that get insulted that you are not interested in some "titty" bar or interested to pay $30 walk into their small dump of a bar where you can drugged or otherwise scammed by those inside. I get insulted because I wonder where does it say on my face that I want to go to as they call it a "titty bar".
There may be a few actual dance bar-clubs, but then many of these owners that collude with ladies that speak Chinese and drug or scam those in the clubs, and steal their money and run up their credit cards. A simple search on Google, will show many accounts of these horror stories. My advice to any travelers is to one just avoid Roppongi altogether, but if you really insist to go to the smaller African run clubs, then be very cautious and mistrustful. Don't bring credit cards or a lot of money there, just enough to have a few drinks and the cover charge. If the girl that you talking to are with insists to go to another place, drop her fast, as she is probably a prostitute or scammer disguised as a good wholesome girl that became magically lovesick over your unique characteristics.
After the night of festivities, walking down the streets of Roppongi, there'll still be mostly Nigerian guys trying to lead you their bars and empty your wallet, and you'll encounter many scary looking, mostly chubby and older Chinese prostitutes whose faces light up when their see a white foreigner by himself in Roppongi. Originally, I was insulted, wondering if I had a plaque on my face that says: I want a prostitute" (something that is repulsive to me), but worse is that these Chinese ladies in the streets , I hate to say it, are really hideous to look at even when drunk. If any person that wanted this type of service, why for Heaven's sake would anyone choose them.
Anyhow, before I was quite angry because they would grab you and try to pull you in some direction. But then I thought well, a little kindness would be better, and it seemed to work, they started to remember me, and recall I do not do this sort of thing. So, I used to be friendly to them, and politely refuse them, but now after getting harassed with this year's batch, I am getting annoyed at tell them that I don't like Chinese: "中国人好きじゃない", and then amongst themselves in either Chinese or Japanese, they say, oh, he likes only Japanese or something like that. The pack of Chinese prostitutes then at least don't accost me on that block.
Now the next block awaits with packs of scary and desperate Chinese prostitutes and more packs of Nigerian scam artists and others that try to get you into their location.