It depends on the player. Remember that how strong the deck in T50 can be, it is still played by the AI (which has flaws and doesn't know the deck).
You can fight the non-farm decks, it will be a good training and you may win. A big part of them are also stall decks or FG farmers, that can be outrushed by a fast deck, or crushed by good permanent control.
TL;DR : Try them, you may win more often than you think.