The Lord of the Rings, The Third Age
I played on easy. Berethor, Idrial of Lothlórien and Hadhod/Eoaden (I wanted Hadhod in my team as he was a dwarf but he just wasn't good enough so I started levelling Eoaden even though this third party member wasn't that important.) were the members of my team.
It was a bit hard at some points, like in Helm's Deep, but then Berethor got a sword with lifesteal and I just couldn't stop laughing.
Berethor had a high chance of dealing counter attacks (costs 0 turns) plus some kind of leadership shout that further increased his and the other party member's chance of dealing counter attacks. When someone or something attacked Berethor he, five times out of six, would counter attack with his lifesteal sword. The lifesteal and damage of his counter attack was so great that received more HP through lifesteal than his actual maximum HP.
On top of this, I had Idrial. She had a spell that gave her an extra turn without costing anything but mana - at the cost of some mana, Idrial was allowed two moves per turn. I then simply combined this spell with another one. This other one was sort of like a buff, when applied the subject would be instantly resurrected with full HP and mana as soon as it died (this would not cost the subject any turns either).
Eoaden had some good tactical moves that I can't remember. I didn't really need a third party member though, as soon as Berethor had gotten his sword.
Nothing seemed to be able to stop me until I encountered a developer dick move, got tired of the game and returned it to my friend.