It's not even that Commander cards shouldn't be printed in Standard sets - it's fine to have a smattering of them - but with so many supplemental products out nowadays, it's almost disappointing to feel as though Commander is still the focus
Your opponents may counter, destroy, or steal him, and if your entire deck revolves around him, you'll be dead in the pool
They make the game lose its identity for the sake of marketing
Heartless Summoning is my personal pet card for big-dumb-creature typal decks, and I wouldnt hesitate to put it in the command zone if I could
Flaring Pain is one thats pretty nice to have if your local groups are wise to your aggro style
They're a topic that generates a lot of impassioned discussion, mostly because every time they come up, everyone starts arguing about the affordability of Magic and how WotC makes the game too expensive to play. There is increasing acceptance of proxies in certain situations , especially provided you are not trying to use fake cards and pass them off as real or using them in tournaments where they're not allowed
