You can find many negative reviews on Mamba.ru, mostly by disappointed men who obviously don't know what they were searching for. Guys, you REALLY want to get in touch with Russian women looking for guys from Western countries you need to visit sites like RussianGirls4u.com. Mamba.ru is not a traditional mail order bride site. I'd rather consider it a social network. Of course you may use it to get in touch with women from Russian but don't get disappointed if they didn't sign up on Mamba.ru for the same purpose as you!
Know what you are searching for. Mamba.ru is great, but not for every purpose.