I wouldn't mind the leveling speed except for two things. Frankly, once a champion hits about level 10, there is next to nothing that can stop them except other champions of level 10 or higher, WITH really good gear and spells. Leveling more is really just generating a higher number beyond that. Doesn't really make you killier, and doesn't really make you survive better.
The reasons it needs to not taper off are as follows; first, Leveling is how you get spell ranks (for some stupid reason), and you only hit your class at level 4.
If you got your class at level 3, and had just one more level worth of access to class-specific abilities, topping out at level 10 really wouldn't be all that bad.You would have a pretty decent shot at getting a level 3 skill, and a level 2 skill in things that you are interested in having.
In terms of spells, though, I've been playing Pariden since beta 5 came out to play with the new Essence mechanics, and I have wanted to experiment with new spell organization and balance, as well as the "Path of the Mage" class. Problem is, just about the point that I get level 4, I stop getting the option to increase my spell rank at level up. I realize its a crapshoot. Problem is IT SHOULDN'T BE. If a player wants to focus on being a powerful wizard at the expense of being a capable fighter, they should be able to do so. Especially if they want to have more than one school of magic.
Please, please, please figure out a better way to open up spell levels. The current system is random for the sake of random and makes playing anything other than a combat focused sovereign/champion a very serious strategic risk. Banking on Air level 3 this level, mage? Too bad. Enjoy Strength, Quick, Potential 2, Adventurer's Boon, and +1 Summon levels (you know, for all one of the summons that you have). Please.