Yeah i gave it a try, and i became gold in 2 hours with summ lvl 36, 3 hours with wl lvl 45, 2 hours with sin lvl 28, 3 days with sf hm6 without hm skills, 2 weeks with fm with all hm skills, 3 days with bm without any hm skills.
So, hell yeah the OP classes are shown.
On the other side, im not saying that summs/scumms are OP in higher gold ladder (if u dont have in mind KellyQQ and few else, that are just IMMORTAL) but they are sooo annoying in the lower gold and silver, a lot of my friends are not enjoying the arena cuz of the thousands of ppl spamming the arena with summoners lo