Currently paladin is too strong for being a support warrior spec especially against casters. This is due to reckoning, divine stun and shield reflect.
Reckoning: The reason that reckoning is too strong is that it has a large aoe radius, it is a lesser forcepull, it has a 3.5 second slow, it interupts warm-up skills, it has a very low warm-up and it cannot be wasted by missing. I am not sure if this is intended but if there is no target that can be hit when reckoning is used, then reckoning will not go off. The cooldown will not start and no mana will be used in this situation. This is very different from skills such as ironfist where it will go off even if nothing was in its area of effect. Therefore if reckoning is dodged by the opponent they are only delaying, not actually dodging the skill. Due to reckoning's very low warm-up it is able to be used very rapidly until it hits its target. I think that reckoning should be like tremor, and it should be able to be missed.
Divine stun: The only problem that i see in this is that it not only stun-locks, but it also silences. It has a pretty low duration however the inability to move makes up for this. I don't think that it needs a silence it is is a stun-lock and it is the only silence that any warrior spec has.
Shield reflect: Shield reflect is currently being used as a temporary invuln in which the paladin uses the time to use pray. This is able to be done because sheild reflect has a very low mana cost (only 10 mana) and the paladin is able to use other skills while it has shield reflect up. I think that a good fix for this would be to up the mana cost of shield reflect to 15-20 mana.
Overall recommended changes:
1. Reckoning: Allow it to be able to be missed instead of not being used if nothing is in the target area.
2. Divine stun: Get rid of the silence.
3. Shield reflect: Up mana cost slightly. (10-15)
Other sidenotes:
Wizard: Wizard is being played oddly currently because of the warmups on bolt and megabolt. Currently the warmup on megabolt is lower than the warmup on bolt. I believe that it should be the other way around because megabolt is not intended to be used in 1v1s while bolt is. This also allows wizards to pull off an insane combo of root, icebolt, fireball, fireblast, bolt, megabolt. If megabolt is eliminated from this combo then it is far less devastating and it also makes the wizard work harder for the kill because wizard is currently far too dependent on targeted skills.
My suggestion: Increase the warmup of megabolt to 1.75s or 2s and lower the warmup on bolt to 1s. Also increase the cd on bolt to 12-13s.
Sorry for the long post, please respond with your feedback.