If you can't solo melee mobs then you need to look through your spellbook again. At lvl 43 you should have two roots:
A group root called Ring of Cold
A single target root called Teather
On any melee mob you should ALWAYS have BOTH roots UP
When one of the roots breaks don't say to yourself "get ready to melee," because you should already be casting the root again.
If you have both of the roots up mobs should very rarely get to you (let alone be able to hit you)
I can't seem to realize how hard it is to kill something that never gets a chance to hit you but it might just be me.
Do you realize the difference between ordinary and heroic mobs? As I have already mentioned, I can EASILY solo non-heroic mobs upto my own level and a even a couple above depending on amount of ^. But when it comes to heroics Wizards suck like babies, however melee classes kill them with no problem.
Of course I use rooting constantly, but IT BREAKS A LOT when we are talking about heroics. Rooting is almost useless against heroic mobs for they break it usually after 1-2 hits and in most cases your spell icon still not charged. I even know the technique "root one - stun another" when u use rooting and Aurora having two separate mobs attackin you. I don't think lot of wizzies even figured out a possible use for Aurora.
So the only thing I can't seem to realize is how to make something never get a chance to hit me when we are talking about heroic mobs.
I guess you have never seen a mob that casts...casue there are quite a few. I think the earilest ones are the gnolls/orcs in antonica/commonlands. The ones that cast. You also say that they only cast one or two times (well if you don't keep them away why should they?) They do loose life much faster than heroic melee mobs but not as fast as you. NON-HEROIC caster mobs loose life as fast as you. HEROIC caster mobs should take a group to take down. They loose life pretty quick in a group situation, much faster than a melee heroic.
Soloing with a wizard aint to hard...if you get a caster mob maybe you should do what was intended and get a group...I'm pretty sure when you mouse-over the name it says clear as day "This monster should be taken with a group of 3 or more."
There are NO caster mobs in EQ2. They all hit 1-2 time and run towards you for melee combat. You can't say that Paladdin is a mage because he has several spells and auras. Pure caster or ranged mobs NEVER go melee or only when they have no other choice. This is what I am talking about.