For the weaker flavored syrups, what I'll do is add some Splenda or Stevia to sweeten it up. Honestly this makes a huge difference with some of the syrups.
I am not a real big fan of the other WF syrups, only their pancake syrup. I do however enjoy their chocolate or marshmallow dips
Davinci syrups are tasty too, but are very watery and many need added sweetners to get a decent flavor.