Carlos your enitre post is completely wrong.
1. Proffesors can train just as easily as any other character due to the large different amount of maps and uses of monsters and with the correct gear which is the same to all characters.
2. Gypsy skills are fucking awesome especially in woe or pvp. How you ever fought against a Gypsy before? Their tarot card is hard to counter and if they party with someone you're going to have some problems trying to fight them off especially when they have a ministrel as a partner. Damn their duets >.> Even with another party to counter them It's pretty hard to do so considering they have so many supportive buffs that can harm targets as well.
3.Stalker is just as cool. The fact they can copy a skill and pretend it's their own is sick. Try going against a bow stalker that has something like Storm Gust copied. In PvM level wise they could easily level with the copied skills of bowling bash from knights.
4. High Wizard I admit is fun in PvP but if only you know what you're doing with it. I mean their skills are nothing but completely magic which is usually countered by a douche in PvP using GTB. Sure they have what 2 skills that can by pass it. But it's damn hard trying to find a build that can make actual great use of those without penalties.
5. High Priestesses are not only good for leveling they are good for support as well. I mean seriously the fact they have buffs like assumptio should already prove how useful they can be. Also their original priest skills are what really make them useful in WoE. They have a lot of uses in woe with the crazy amount of buff skills they have. Also with their Meditio it's damn hard to stop a high Priestess from keeping herself alive. (Why do you think a sinx can have so much trouble taking one down?)
6. As for sinx they are not boring, I admit sins are common but even THEY can be fun depending on how you play with them. I mean seriously it's not just click and watch you know. I mean their skills give them a little more then just a good DPS character try using them and think of some strategies you'll be surprised at what you might see later.