To answer part of the question, The cleric was given buffs so that he didn't just stand around waiting for someone to get hurt. It has been said many times on these boards, but not only is walking wand of CLW not a viable character concept, it isn't generally fun to play. At the same time, if there was an assumption that clerics didn't buff themselves, as some have asserted, then why would many of the best melee buffs for clerics be personal only?
The cleric does need something better than just walking wand of CLW as his role, but the problem is finding a role for him, and making him decent at it, w/o making him a clearly overpowering choice. An archer cleric does this rather well IMO.
I think the problem with the Wiz is an actual issue with the fact that blasting isn't viable compared to the other strategies. Damage spells are not good enough, and the SoD and SoS spells are both too prolific and tend to be too good. Evard's interracial hentai is fine, but Trap the Soul can get downright ridiculous. Really, if it's a SoD or SoL it really shouldn't have any effect on a passed save (well, Fear is okay, but there are too many spells that are too good not to use even if the enemies always pass) so that the half damage provided by a fireball is actually a feasible choice.