Is Memrise too slow?

Hi, I have started using Memrise to learn Spanish. It is a very good site with a lot of helpful and free content, but I got really bored doing the exercises. I have only tried four, but I think I can move much faster on my own. For example, instead of taking a Memrise class for the most important words in the Spanish language, I can download a list of these words from any other site, and finish them in a much shorter time.

What do you guys think? Is there any other benefits of Memrise that I don’t know of?