I don't think I ever realized that that was a shield grandfather orc is leaning on... A couple random comments, since the dragonrider must meet all prerequisites for the bonus feat at 3rd level not all dragonriders will be able to take weapon specialization which is slightly amusing. Also Dragonrider makes a good starting PRC for Dragon Rider prc from dragonlance campaign setting especially if you can convince your DM to let the immune to frightful presence of dragons replace the Resist Dragonfear feat...

Anyways not the best prc out there but it does what it says it does and I am ok with 17/20