Sorry that I have to ask this, but how do you find out how many thumbs up/down your arena deck gets?
I'd also like to add that if you want to thumb up/down "fairly" (based on originality) you have to consider the oracle card and that you probably won't see all of the opponent's deck. My last oracle card was devonian dragon - five of those roughly need ten time pillars, it's tough to make anything original starting from that, for me anyway. It reeks of mono time, it actually wasn't, I added a few darkness pendulums, nightmare (I admit) and devourers so it wouldn't be mono time. Still, chances are some only got to see time quanta/cards, for some it maybe felt like a boring Ghostmare deck though it wasn't really (two of each in a 40 card deck, I think).
Also, as somebody rightfully pointed out - I am in the gold league but I lack a lot of cards across the board (and won't buy them just to make an arena deck), let alone upgraded cards, of which I have far too few. And that limits my deck building greatly. I avoid the overused decks I myself encounter too much, I try to give people a bit of a challenge so I test my decks a few times to see if they work at all and that's the best I can offer.