How good are they? Where can I find one? I need them because
"Curved. Swords."
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Sign up to join this communityWeapon base power is "11", which puts it at the same damage as Elven Sword, Nord Hero Sword, and Skyforge Steel Sword.
http://www.uesp.net/wiki/Skyrim:Weapons#Nord_Hero_Sword
The attack power can be augmented by blacksmithing. It is further improved by Steel Smithing.
As for where to obtain:
http://www.uesp.net/wiki/Skyrim:Specialty_Gear#Scimitar
As for how good they are, if you put effort into keeping blacksmithing high, they'll do fine. Just save a pair for end game enchanting. At the end game the weapon damage becomes almost irrelevant. I dual wield two Blades Katanas because... Katanas.
I think the weapon you are looking for is the Scimitar.
It cannot be bought from any vendors, however, there are some ways to obtain it. One of them is when there are two Alik'r warriors looking for a redguard woman in whiterun ( a quest named In My Time of Need). Just kill them and take their equipment.
The stats are mediocre, it is almost the same as the Elven sword.