I'm still not clear whether the level cap applies only to the DLC. If that's the case, I have no problem with it.
I think that's part of the main draw to get people to buy the DLC. If it were just in a universal patch, regardless of whether or not you bought it, it would somewhat denote the value of the DLC. Just my opinion.
As for my take on the actual increase myself, its just saying congratulations for, "Yay! You've done enough killing / questing in order to me to see you fit to level. Now get back to work!", for another 5 times. Even after those 5 times, I'll probably still be working.
I hope by the time the DLC comes around to the PC, I'll have my 6th character all ready to go for it. It'll be the first one that has an XP mod to slow its progress actually.. I guess I just want the base game to last longer as I clearly have gotten a bit too used to playing with normal XP, regardless of weapon types.