I've played the beta a bit and I am in full agreement with you on the lethargic comment. Everything I did seemed... slow or clunky. I enjoyed the classes I explored, mainly the Dwarven Engineer, the Greenskin Shaman and the Elf Shadow Warrior (not the right name... the ranged guy). They all were unique and had interesting aspects to them. That being said, all my actions felt slow, the run speed felt slow, getting around was time consuming. This was really my only complaint.