My complaint is a legend requirement for skills I can only train while in a group. As a player who has predominantly soloed for ages this means finding a group and hanging out with them for literally a couple of day until I master the two skills I need for legend. I'd rather solo.
I recall you played mostly mages and warriors but even rescue can be trained solo with a charmie. are you thinking of other classes?
Of all the classes I've legended (mage, barb, shaman) the worst skill by far is banish and not because of the time. It is worse than the 'solo' skills because you cannot really solo it. It is worse than the 'group' skills because the 'engage' chance means that practicing while travelling or memming means that it disrupts group flow more so than all other group skills - so much so that you need a friend to give up their zoning time for your skill. Group skills like Rescue, Battle Cry, Inspire, Rally and even Taunt can all be practiced while only 'somewhat' impeding the zoning process. Banish just shuts it down completely because you have a chance of attacking a groupmates charmie.
Agree that banish is the worst. The only way I've been able to do it is to find a druid who is willing to spend 4+ hours sitting in a room and conjuring things for me to banish. As a neutral, it's hard enough getting the required spells for a legendary shaman, but at least I have fun running hard zones and looking for those spells. Training banish is the opposite of fun.
Arctic is "different" than most games out there, and skill training/grinding has always been a rite of passage for anyone who plays it. However, it is a GAME after all, and if there is literally no fun scenario in which you can train a skill, then maybe something needs to be re-worked with that particular skill.