Let's note that the critical build is not a waste, but for two handed warrior (and clerics) they just don't come as often, as said, is better to start with heavy hand, or body development.
Why not have a companion?You don't need Dungeoneering, Scrolls or a Companion for that. I don't agree with your Advanced Skills either; 2H weapons have a low chance of Crit and hit less often triggering Crit chances less often. IMO Body Development is gold for you, HP bonuses from both high STR and END. Heavyhand is better than Duel as you'll keep resetting Duel via Change and Whirlwind. Once you have both of them maxed, then go for Crits. If you're going for Fury, then one point of Battle Rage won't hurt.
Hunt Rumour Bosses too; Liches drop Ring of Unlife, Dragons drop Myrosian Brestplate.