Celebrim
Legend
In truth, I only posted this because one of my players wanted to play a half-dragon stone giant. Maybe the higher LA's aren't such a bad idea...
LOL.
Yes, I would say that they were. As I said, I'm not a big fan of "monster pc's" (even though I once ran a campaign were the valid racial choices were kobold, goblin, hobgoblin, bugbear, and gnoll), but I'm even less a fan of playing +LA templated creatures. The +LA templates are a case in point about why some sort of XP penalty is essential.
A 1st level half-dragon human fighter is probably slightly weaker than his 4th level human fighter comrade, but not by that much only because of the relative disparity in HD means that half-dragon has so few hitpoints. As the level of both characters increases, this relative disparity will disappear. By the time the 20th level human fighter compares himself to the 17th level half-dragon human fighter, its no contest, the half-dragon fighter is hands down superior with more skill points, higher damage, nearly identical hitpoints, and a host of minor benifits like darkvision, immunities, and an occasionally useful breath weapon. Pretty much all the +LA templates are like this, weak for the first few levels, then quickly outstripping non-templated creatures in power. Half-Celestial and half-infernal are even worse.
I can't possibly believe that there is anything about the personality and life of a half-dragon stone giant that is intrinsicly interesting and worth exploring that is unique to half-dragon stone giants and which would have sufficient depth to be worth exploring as a PC. I can barely imagine enough personality for this thing to make an interesting NPC. I think the real 'interest' here isn't the character, but the 40 strength, huge size, insanely high dexterity for such a large creature, +15 natural armor bonus, base 40' speed, immunity to paralyzation, etc. That's not a player showing an interest in a character. That's an interest in mechanics, and mechanics do not entertain me the way interesting characters do. Anything that doesn't entertain isn't going to be approved.