Probably gonna be picking this game up soon, I'm a huge LOTR fan but due to all the glitches and bugs I've heard about, I refrained from getting this until the price had dropped. So where are these bugs, and how do I avoid them? Also, how game breaking are they? Will I have to restart just that level, just that playthrough, or all my progress entirely? For example, if I complete the game on normal, and become stuck on heroic, will I have to restart just heroic, or normal and then heroic as well?