Your joing right? Some Special Characters are worth their weight in gold.special characters are not competitive, TWC are not really that good for the points either.
Vulcan? Eldrad? Kharn? All are very solid SC.
And some of the Space Wolves lists that have done extremely well have used Thunderwolf Cav.
Be very careful when you make broad statements like that, as more often than not you'll find there are cases where you are completely wrong.