My initial post about Tracking being bad was more in line with Deathrattle and Recruit Hunter. It's obviously bad to average in spell hunter, especially if you're playing Zul'jin (which you most likely are). The argument about the cards being on the bottom is invalid, especially in the case of recruit hunter. You are completely losing cards that you could have otherwise recruited. It makes Kathrena a dead card later in the game for deathrattle hunter. It even makes Oondasta worse later on if you keep discarding good cards (granted you might want to even take the King Krush with an early Tracking if you're playing Oondasta). And people brought up not playing it against an odd warrior. So in that case it's a pretty much completely dead card unless you're desperate. I would much rather use a more versatile card in the deck.
I think the only deck that Tracking really works in is a standard, run of the mill midrange hunter. Anyways, it's probably best to just use your own judgment with the card. I personally hate it, and I've had a ton of success omitting it from my decks. Do I not know how to use it? Even if we assume not, I win without it, so screw all y'all haha.