I know what you mean. My party is dominating in combat right now. Once we came into a decent amount of gear and skill selection we became unstoppable. Haven't had to reload a fight ever and I'm level 12 right now on normal difficulty.
On the other hand, I really, REALLY like that the game is accessible. I feel free to experience the game in other ways and appreciate I don't have to build an ideal party or use the optimal tactics to win.
Perhaps future mods (or upping the difficulty setting) will scratch the itch for more difficulty when you use an ideal party and superior tactics.