

Left4Dead
Fatal flaw: Versus mode (PvP) with random strangers is almost always awful. Only well-balanced teams of roughly equal skill can have a good time, which is unlikely when playing with randos.
As opposed to the co-op campaigns where it’s OK if some players are better than others because we’re all on the same team and a good player can carry several n00bs.
The trick is to bounce both legs but in opposite directions. When one is going up the other is going down, cancelling each other out.