He's not useless, this page should be updated, I use him in my fusion deck in combination with "Fusion Weapon" which gives him +1500 ATK and DEF, so he essentially has 3300 ATK and 3100 DEF + whatever other bonuses I give him. He plows through monsters.
Oh and also the added benefits of him being a fusion monster, you can use monsters on the field OR in your hand to summon him. And of course the fact that he's in the extra deck so he doesn't take space in your main deck.
You could just play Meteor B. Dragon instead, and Blue Dragon Summoner can search both of its materials. Even. If you can't aford it, the same applies to Gaia the Dragon Champion, so this card really is useless.
TRIVIA : can be special summon by Blue Flame swordman after success fusion summoning are destroyed