I don't know about werebears and werewolves and their differences. Werebears are said to be weak to the Canis Root or whatever, but it hasn't been proven since we don't have any damn werebears in the game haha. Werewolves are often the most dominant or at least the more likely Lycanthrope to encounrer, since they are all over the place.
I agree that they should definetly add some strength, speed and powers for werewolves and werebears in the game. I hate walking around seeing Aela the huntess carry a torch. Why does she need a torch when she can tell if a werewolf is part of her pack or not just by the smell? In Daggerfall, the character had heightened abilities. In Skyrim, all they got is resist disease. All least give us an ability called "Eye of the Wolf" which can detect prey and see in the dark.
As for bears being slow, I doubt it. Sure, they might have a super powerful swipe that can disembowel a man in moments, but even mundane bears are fast. That's why they say you can never outrun a bear, because they are very http://www.youtube.com/watch?v=ECheuuS5F80.

LOL!