Edgar and Sabin in FFVI-Awesome
All the Royals in FFV- Awesome (if you used them right)
Edward in FF4- Horrible
Edge in FF4-Awesome

Therefor, most royals aren't that bad... What about the Onion Kids in FF3j... They are orphans taken in by the mayor which wouldn't be royal, but nobility.. or at least above commoners.

And FF2j, i don't think that because he's royalty he sucks, you just didn't get his stats up to par...