I never said spells were more powerful or better than shouts. What I said was that - as a whole - I use spells much more than shouts. When I do use shouts, I use them primarily because I need to. When it comes to gameplay though, I have focused on spells and melee to win fights.
Why? Because shouts feel unnatural. I know shouts are meant to be the center piece of the game, but I simply can't bring myself to play them in that way.
I'm on the PC and always use the "alternate Start" mod, so most of my characters don't start at Helgen, never encounter dragons and never learn any shouts. I don't mind shouts, and miss them on some characters/builds, but I prefer to mix things up in my play-throughs and not do the same quests every time.
My vampire hunter for example has over a 100 hours played, finished the Dawnguard and a whole bunch of other quests, but has never seen a dragon in her life