"There's only a small handful of guilds that even matter in pvp. Not to mention the leveling exp differential is so gigantic."

True. The only Four guilds that matter in PVP is AM, Fighter, Nightblade and WP. AM due to being completely unbalanced, with super-powerful spells for surprise and escape, as well as the by far strongest PK spell. WP, Nightblade and Fighter the only three guilds with anti-stun. No other guild matters for PVP. Seriously. Unless a WP, NB or AM (of higher level than me), Miki doesn't look twice. Just, whirl, focus and win.

In a way, Paladins can compete, if they train very very smartly. None have, so far (I wont tell you how. If you don't know, you wouldn't be able to use it anyway). Chaotic-Lords/SMs are the weakest of the semi guilds, and can never compete.

The difference in XP gain is a complete joke. Will it ever be fixed? No.