Thank you so much for the kind words! I'm really glad you persevered through the aspects of the game that annoyed you!
There is another ending, actually. After you beat the game once, you'll notice a thunder sound on the title screen. That means the new game is a new game+, which is basically the same thing except for two things: Superman gets a new ability, and you're given a choice on the Morrigan fight that leads to the other ending. Actually, if you have a save file before the Morrigan fight, you can get that choice even without starting a new game. I wouldn't call neither ending "good" or "bad", they're just different.