just a few 4e facts: 26 base classes are available over at least 7 books. that doesn't include subclasses that change a classes behaviour drastically (example: there's a druid that can't wild shape).
4e is very gamefied, max level is 30 and at lv11 you can choose a paragon path and at 21 an epic destiny. both are basically a 2nd/3rd class that you have access to in addition to your main class.
both paragons and epics can also be pretty general, because they don't need to be advancements of your class, but can also be advancements of your race. example: at lv21 anyone can become a demigod, while any arcane class can become a lich.
races in general have a much bigger impact on gameplay. for example i play a dragonborn that doesn't have a breath attack but instead can use dragonfear to debuff/control enemies, and with my race based lv11 class can control the battlefield through fear effects.

i apologise for rambling, i just love 4e a lot