I need some one to explain all the love for Star Wars and Star Trek?

I hope people dont start freaking out on me here because i know how touchy the fans are but as an avid movie goer, i love studying complex films and depth and all that, i just dont understand the love for Star Wars or Star Trek, both series to me are full of cliches, bad characters, terrible dialog, predictable twists, bad acting at times(Hayden), etc.

Im not saying i dont like Star Wars or Trek, theyre cool action romps, but theyre nothing more then that to me, why do people hold them as being THE BEST scifis?

Is it just a nostalgia thing? or do people see things i dont see? or am i just "spoiled" in terms of movies because we've gotten better since the 70-80's?