If you spend a lot of time on warriors late game, they are still very useful. The only challenge is keeping them from taking hits from crushing blow or other one-shot-kill attacks.
Blade rush not only lets you damage multiples, it basically is a free teleport.
Load your warrior up with good plate mail (preferably champion armor). High defense and HP, and they can take some damage.
The decimate trait lets warriors do lots of damage to units of multiple troops.
Make sure they go in with other melee units, too. Another idea is to use summons to always give the AI a weak monster to target. Meanwhile, your warrior rips them apart.
If you can get a 28+ initiative on your warrior, you often can retreat after attacks to avoid hard hits.
Finally, compliment your warrior with a strong healer. If the warrior is getting punished, the healer keeps it alive to keep dealing damage.