One can argue for a while whether it is necessary to entrust the search of your happiness to dating services. There are both obvious pros and contras.
Certainly all those organizations have a lot of professionals working for them who know foreign languages. However, they are not charitable organizations, but commercial. As they are commercial, it is favorable to them to work either with rich clients or with beautiful women.
If you decide to act independently, you can only blame yourself for failures. However, you could become the creator of your own happiness, too.
In any case you can choose both: to address a Russian marriage agency and to try to search independently. You would even be able to compare the results - and see for yourself which had worked for you.