Weakest class, What is the weakest character types in the game? Options

[Ryel ril Ers]

The topics a little bit strange, but i want to hear pros and contras of the "weak" classes.

One: The players see what are the worst choices, and which character better that position.
Two: There are nonliked classes and i want hear that they are really useless.

[trufa]

The Blade, and the triple classes can use missile weapons, the monk can't (?)

The Slay Living is very risky, because the saving throw, and if the opponent makes the sve, one lvl 5 spell is waste.
The Hideous Barrier is more cheese, as the misleaded bardsong
Yes, he could a FT, but only with 1 attack/round effectively
R. Magic, also 1 attack/Round effectively
You can reach 4 attack / turn (dualwield+imp. haste), but in this case, you will have a very High THACO.
Cleric->thief only with maybe the lathander priest
With a mage-> non spellcaster you will have some useful low-mid lvl spells, like Stoneskin, Mir. image, Haste, Knock, maybe a Spell Immunity, MeMiMe, etc, so the mage->non spellcaster can be very-very cool class with the right tactic, because the low HP