I would prefer they were relative rather than cumulative.
So a if a spell costs 100 Mana to cast.
With 1 -25% to cast you cast it for 75 Mana
With 2 -25% to cast you cast it for 56 Mana
With 3 -25% to cast you cast it for 42 Mana
With 4 -25% to cast you cast it for 32 Mana
So while it is still a really useful enchantment, diminishing returns mean you may want to examine other options.
That is a pretty solid idea.
Oh wow this is chameleon all over again.
Its really annoying that some people do not understand what optional means, nor single player.
Quite true. It's optional. The only problem that I see with the game is that they lied to us. They said you can be any type of character you want to be. That the game would accommodate your choice of build. Well, it flat out doesn't. The alternative paths to complete quests is quite lacking.
There is also the "forbidden apple" effect. People feel the need to do it just because it is an option. So rather than will themselves not to take a bite, they simply want the apple taken away.
If that's the case they really are playing to the lowest common denominator. How many game breaking options are needed? Personally, I'd like to have to go out of my way to break the game. Not go out of my way to not break the game.
This is very true. A player should not have to go out of their way to not play a certain way simply because doing so with either make them god like or make them a practice dummy. Now, whether or not this particular case is in the way or if you have to go out of your way to trip over it is debatable.
They scale based on difficulty so a master difficulty dremora lord is buffed to hell. @_@
You and people like you are everything that's wrong with the mainstream gaming

It makes me sad that people no longer care about a challenging game. One the not only pushes you to make the best character possible but once you are at your "best" it just pushes harder. Hordes of casual games have ensured that developers make sure you can be content with mediocrity and making the best character possible just trivializes the entire game instead of making the hardest difficulties possible.
I fart in your general direction sir.
The problem is with the "best character possible" which to many means building your character just one way. This was something they were trying to avoid, even if they did fail. People get these games and then they study the s#!t out of it looking for ways to make the "best character possible". Then they complain that the game is too easy or that there are 'exploits' they want fixed. I think that when it comes to these people, it's not that the game is too easy or that there are exploits, it's not about playing the game at all, but rather it's that the mechanics of the game was too easy to figure out and exploit. Which is also why people complain about it being "dumbed down". Gameplay wise I find this game to be leaps and bounds above Oblivion and steps above Morrowind. Game mechanics wise, it is simpler than either.
The leveling system is a lot smoother and I think the game is all the better for it. You decide on a way you want to play (warrior, mage, stealth) and you pick a race you like that falls under the style you want. Then you just start playing. Start gathering quests and carrying them out. Fallow and enjoy the story that each quests brings.