If he's willing to play it again to see if his opinion changes, then I'll support whatever his opinion is.
Apparently he's been spoiled by Twilight Princess combined with the Smooth Wiimote+nunchuck controls before having ever played OoT. I can totally understand if he's feeling jerked around by the controls, and a bit let down with the plot, especially with how much hype it has.
I had trouble attempting to play Twilight Princess using the gamecube's controller, so if I had never played OoT until after having played TP, I'm pretty sure I might have had a similar opinion.
Seriously, there needs to be a slogan, like: "Once you play Wii, no other console for thee"
Still, you don't need to beat a game in order to judge it, but it sure as heck needs more than 5 minutes... I'd say... play it up until you at least go adult link, and get the bow and arrow. I think that's where the game really hits its stride.