I know what I read, Matt.
Here is a quote from Brisingr.
In length, the sword was equal to Zar'roc, but the blade was wider and the tip rounder and the build of the hilt heavier. It was a beautiful, deadly weapon, but just by looking at it, Eragon could see that Rhunon had forged Tamerlein for a person with a fighting style different from his own.
Later in the book just a few pages while they are forging Brisingr. Rhunon said that she would make the blade tip thinner because Armor had improved. That is the reason that it is wider because it is over a hundred years old and armor was different then. Tamerlein is not as you put it "Blunt" just from a different era, and would still be VERY deadly in the right hands.
And thank you for the oh so nice comments about Rhunon and me.