I don't mind the level 10 cap, for the most part.
The only problem I have is that, in all my years of D&D (I'm new to 5E though), Wizards and Sorcerers suffer until they hit level 6+. So I feel like they will hurt the most with level 10 being max.
This is my mine problem with the cap I really like playing as a spellcaster and the Sorcerer is my favourite class