As everyone else says, there are certain parts of Dragon Age that I found to be literally unbeatable until I put it on easy mode on my first play-through as a mage. The first time was at the very beginning of the game in Lothering, where you had to kill a bunch of bandits that had some Mabaris with them, and the second time was in the final few boss fights, the one in the elven quarter, that I tried about...16-20 times before I finally relented to turning the difficulty down. He was completely invulnerable to magic and yet could dish it out himself, so he easily wiped my single melee fighter before the horde at his side went and overwhelmed us. My entire strategy at the time depended on my blood mage holding the big group and then all of them would target who they need to target and it was extremely easy right up until then. I almost completely stopped playing, then, but I went back a month later and finished it.
Also, I have a lot of trouble with God of War. It's not hard as much as it is incredibly annoying-you have to hit every single fucking enemy hundreds of fucking times for them to finally die, and then another twenty come at you ten minutes later. It's so god damn frustrating when you can't kill these little dog things after ten stupid hits and there's twenty of them performing unblockable attacks constantly.