First off, it is not very responsive when I try to cast it after being frozen or jailed. Half of the times I cannot seem to use it immediately after being trapped. Sometimes it won't activate until I've been frozen or jailed for a few seconds. Other times, it would take 3 or 4 button presses to cast it.
Second, players should have more control over it. For example, I shouldn't move in random direction when I cast it, but move in the direction of my cursor. It is pretty bad when you try to use it to break out of frozen and it ended up moving you into a molten pool or a monster pack.
Fourth, many of its runes are useless and the images are problematic. For example, Extension of Will is completely pointless. What am I going to do with that extra 4% of health and 3 seconds when they already die in 1-3 hits? Moreover, mirror mimics won't use most of our spells except for the selected few, and 10% damage is really lackluster. Heck, most of the times, the images won't even attack but to run around in circle. I mean, when I use mirror mimics I want them to do their full10% DPS share in that 7 seconds, not to do a marathon around me for like 5 seconds. And what am I going to do with mocking demise when the images run away from monster (why not make them kamikaze into monsters for example)? I feel like many of the runes can be combined or remade. For example, making the default mirror images do 10% of our spells will make it much better, after all it is a "mastery" wizard skill. Not to mention the hp of the images are a giveaway in pvp and many of the players spells don't even auto target the images.
These are just from the top of my heads, I am sure you guys have more. It is a really limited spell as of now, and I feel it really needs a fix.