While Shane's comment is correct, in the grand scheme of things, the real answer to your question is that people generally refer to the La7s/Spit16s/Nikis as "dweeb" rides because they have no glaring weakness that can be easy and consistently exploited.
They tend to do everything at 85% and above, whereas almost every other plane in the set has at least one distinct disadvantage. Jug can't climb, 190 cant turn, pony cant accelerate, etc. The 'dweeb rides' can do all those things and, in many situations, better than the rest in each case.
As an example, if you're in a 38J, you can generally out turn what you cant out run and out run what you cant out turn. These rules do not apply when faced with a Spit16, however, because it can do just about everything better than the 38 can, placing the 38 at an immediate performance disadvantage and without any feasible options, regardless of player ability.