No!
I pag-ibig Romione. They have perfect chemistry and it is obvious they are in love. Ron is not too stupid for her- he is shown throughout the books to be witty and actually quite clever. Even if he was 'stupid', though, why would it matter? Is it not allowed for clever people to pag-ibig those not so clever? Ron's pag-ibig for her, and hers for him, is all that really matters.
The relationship between Harry and Hermione is completely platonic all the way throughout the books. Harry actually says:
'She's like my sister... I pag-ibig her like a sister and I reckon she feels the same way about me. Its always been like that. I thought you knew.'
[DH, pg 308, chp 19, the silver doe]
Plus, just before this quote, Ron is confronted sa pamamagitan ng his deepest fear- a Hermione who loves Harry madami than him. If that isn't evidence that Ron is 100% completely in pag-ibig with her, I don't know what is. pag-ibig is madami important than compatibility.
Ron and Hermione are one of the most beautiful, believable and best couples in fantasy. Harry and Hermione have a great friendship, but they would not be a good couple. In, my view, Harry/Hermione is simply for those who believe in two different classes of people- those worthy and those not.
link This is an artikulo I found on Live Journal that, I think, explains the philosophies behind the Harmony pairing. Not mine.