It's not an awful card, but it doesn't offer price match protection (you buy a TV for $999, a month later it's dropped to $799, with the cards I mentioned in the first group you'll get a $200 rebate).

Also, anecdotally, Capital One doesn't seem to grow as reliably with you as other cards. That is, more people get a $5k citi, chase, amex, etc, that grows to $25k than happens with Capital One. It's not unheard of, but generally the accepted consensus is that Capital One doesn't grow as easily.