I don't know, but i use my magnet warrior deck and despite not being meta or anything, it's dang fun to play, and that is what matters. I'm currently at lvl 12.
I'm trying all kinds of decks with my f2p set, it's very hard to climb up, I got some good cards though but my problem is that I avoided the meta cards + reset box so now I got trouble, but the game makes more fun if I win a duel with a non meta deck I like.
Well my friend i can't really say that they're fun cuz i don't have the cards to make a good deck around them; missed a few when the event was around. I'm sure they have their fun factors too :).