I joined a beginner guild, called To the Top, and it has been an interesting experience. I like the comraderie, but there has been little more addition to the playable game because of it. It takes some time for all new players to earn enough DEC to even start battling in arenas. It looks like it does get fun at higher levels.
My advice is try everything that is an option. The more you know the better you will be and the more fun will be available to you.