Community

My experiences have mostly been negative.  I have trouble remembering all the details.  I vaguely remember one guy who seemed to be absolutely terrified of my Seal of Fire s and Pyrite Spellbomb s.  I've had other guys who blatently ignore obvious combo pieces like Geth's Grimoire and Megrim , even in the same deck.  Most of these experiences come down to "sometimes people suck at Magic".

I've equally been unhappy with how easily some people are directed by the first person to holler "HE'S A THREAT!" and point a finger, as if your opponent's have your best interests at heart.

Your list of "scary cards" looks pretty legit to me.  Establishing a Forbid lock isn't as hard as it at first glance appears, and Isochron Scepter is pretty nuts (my ex-gf had a deck that abused the heck out of it, pairing it with Lightning Helix for many games that were foregone conclusions on the second turn).  The only thing that might be missing from it is board-dominating equipment (e.g. Umezawa's Jitte).

I find people over react to easily answered large creatures, but fail to appreciate how nasty a powerful enchantment like Pestilence can be.  That more than anything else has been the source of much of my frustration.