???? No, I think in game it shows quite well how he knows how to use materia. It is like saying Lightning wouldn't be able to use paradigms well because she hasn't had any formal training in them.His significantly inferior training would like affect his Materia strategy. So a questionable suggestion of Materia reflects that.
To the best of my knowledge Lightning wasn't super bad ass special ops trained, she was just regular military. Which would be somewhere in the same ballpark as the training Cloud received to be a regular member of the Shin-Ra military. The training she received definitely wasn't up to the level of SOLDIER (yes, I know Cloud never got SOLDIER training either)His significantly inferior training...