I would change two things:

1. Summoner should be a summoner in Final Fantasy term and not a Warlock from World of Warcraft. Class should be about the summons and not the caster.
2. Bard should either go back to 2.0 version and have more mobility or they should introduce a Ranger class that plays like a 2.0 Bard without the support skills. Instead Bard can stay being a BowMage, but in return gets more support abilities.