1. Bethesda are very good at taking on old fantasy ideas and making them their own; making them interesting. Hell, Bethesda had Warcraft Orcs before Warcraft did! I'm entirely confident that Bethesda will set their dragons apart from those that are seen in every other fantasy text. I mean, just look at the lore for Dragons. They already have, if you ask me.
2. Dragons are awesome. Even if they're cliched, dragons are just a metric [censored] tonne of awesome. So it doesn't matter anyway.