I just dislike characters who have decent combos that start with mids/lows. They always go right under my highs, and both Rig's and Ryu's mids and lows aren't very fast so even if I don't do a high I'm still in trouble
I used to hate Lei-fang too. Now i dislike all characters with lows that give deep stuns, especially if they are the first hit in a string, since they can really wreck you online.
@Brute: Nah. If you hate OP low pokes, it is not Helena lol. Its easily, Ayane, Christie or Brad Wong. Helena does have good lows and some that cause deep stun but hers are not all that fast aside from the 1p and 66kp strings.