I agree with you that armor lock should not return, although i do argue that you are not invulnerable when using it. When you enter AL two things can happen:1. Your teammates kill all the enemies that are after you, making it safe to come out of it.2. You are surrounded my the enemy team, having no chance of survival.so yes, it does have a weakness, not to mention if you use it in FFA you are totally f***ed.The only reason i want it to go is because im a BTB guy and hate being killed in my ghost by some noob using it.That being said, all the others should stay.Sprint and evade are excellent for speeding up gameplay. In general, AA add more layers of tactics and strategy to MP. With evade and sprint you can flank the enemy or escape a fire zone to regain your shields. Jet pack allows you to take enemies by surprise from above or below, keeping you on your toes.Contrary to your belief that Halo 3 MP involved more strategy it actually has less. When there is an absence of factors which allow you to "run" or control the map, it comes down to who has the best knowledge of, get this, camping. And thats what it boils down to. The absence of increased mobility promotes camping as a easier way to get kills that actually using tactics.