Good card is good, but not so almighty. After turn three, it's pretty much an entirely dead card in your hand, and I've yet to use its foundation side even once.
With that said, I DO run 3-4 copies in pretty much every Chaos, Evil, and/or Life deck that I build, but it's certainly not so format defining as Olcadan's, Chester's Backing, China Box + ProMal, TWOP, Rejection looping, Battle Prowess, Defender/Spike, etc.
When I build a deck, I give TAK' a mere moment's thought; I give the others a LOT more thought and analysis to make sure I have answers.