Your team has been very innovative and this is really the best game out there in my opinion.
1- Allow all characters the opportunity to solo and make them more of a match to your mobs.
2- Create quests for master spells in addition to the drops. Not everyone is lucky and questing for master spells would be incredible fun and provide more content for everyone. These would not be easy quests but moderate difficulty and class specific. This way you don't have other classess completeing quests for master spells to sell.
a- Make more class specific weapons and armor quests.
3- For all classess a specialization in combat on a particular type of ability. This would be to improve on a skill beyond the cap for that character level. This would also allow for higher efficiency of that skill or skills.
4- Let mage classess wear light armor and make current armor more fantasy like-- more sexy like the images prior to release. Running around in bland robes gets tired and specially when everyone wearing the same robes.
5- Allow quests for horses and carpets- and add other types of creatures as means of transportation such as griffons, lizzards, small wyverns, spiders - these creatures would not be for use in battle but could be used as aggro shield to escape from a complicated situation. These types of mounts would not be available until a higher level.
6- Make familiars have a a purpose like in all fantasy novels.
10- Give necros/conjuroros an option to select the type of pet they want within their level spell. For example: Level 50 pet spell- option: lesser demon, skellie, lamia, nightblood, water elemental in form of golem, fire elemental in the form of a watcher, burning phoenix, a large poisonous snake, and bring back the spectres. The point of this is to really let the individuality of the person come out and helps them be unique.
11- Illusionists: should be able to pick any creature and gain some of the creatures abilities- it would work like a buff but a very effective one- self only and it would be consistent with that characters level.
12- Don't make quests simple, just make them challenging-- lower quest spawn times-- challenge does not mean spend >2 hours waiting for a mob to pop-- that is a waste of time-- specially for a signle parent like myself.
12- And then fix all the balancing issues--- as long as all the classes can hold their own in a solo encounter with a mob you will see everyone happy. Remember not everyone likes to group.
I am sure I left out other things and other issues with classes but these were the suggestions I came up with.
I think you have an amazing game in your hands. Please consider the posts and help make this game the most amazing game around. I really think it can be.
I will continue to play and hope to see amazing things in the near future.