yea but that power makes having Forge on ur team more valuable than Cyborg, in terms of technology. Actually everyone of those Marvel guys demonstrates some kind of "superhuman" intelligence quality. Sinister, Apoc, and High Evolutionary are all mentally elevated to some degree; Doom and Richards are even smarter than elevated beings with no explanation; Mad Thinker's brain works as human computer...Stark is the only "regular" guy there.
Creating things and understanding them. Forge doesn't understand half the things he makes. He stated thus several times. To him he just thinks of a purpose and his mutant ability takes over. He only understands at most the fundamental aspects of what he makes. Like how to turn it off and on.
Forge isn't a genius. He's above average intelligence.