I'm a huge fan of splits and was quite pleased to pull a High Tide from my Flames of Fame. I don't mind split attacks existing as long as the attack side isn't crazy good, because the control check should make up for it. I can pretty much guarantee I've run Echoing Roar more than anyone else.
Splits are awesome for their sheer statistical reference. An attack that has a 5 check? Yes, that would be wonderful with my Battledisc System. Should said attack also be great? Probably not. In most cases they weren't, so they were pretty well balanced. Obviously, Clones was a big exception.
Also when I think of an attack as being a split I only really consider those with a check of 4 or higher. If I wanted to run a 3 check attack, there's plenty of better options. Long story short, I'd love to see more high check split attacks IF there continue to be abilities that reference them. i.e. tNCG or Tricky Basket or Repetant Hero, etc.