I just can't stand how 4E is basically all stuff you see in games like WOW.
Yeah, it has character classes, and races, and treasures, and magic weapons and spells, and you gain experience and level up and there's hit points and...totally like WoW. Absolutely.
The character stuff is so limiting and there's so much effort to balance that most of the classes and characters are too powerful it seems.
Character "stuff" is limiting? You can play a fighter, a wizard, a rogue (thief), or a cleric. There's humans, elves, dwarves, and halflings. Pretty much the classic D&D setup already, and that's only half the races and classes. If someone is unable to put together an interesting
character within the framework of the rules, I'd suggest that's not a problem with the system.
Your second objection is completely nonsensical. The game is balanced -> overpowered? Bwuh? I'm going to guess that you haven't actually bothered to understand how the game system functions, much less played it. But it "seems" overpowered. Maybe, and here's a thought, it was simply designed to let the PCs be mighty heroes and badasses. Not everyone likes that (hell, I love going back and playing OD&D sometimes), but it's not a fault of the game to succeed at its design goals.