Can you apply an option for Rangers to "ditch" their animal companion in exchange for some other benefit? Even if it's ultimately less effective than the range of utility provided by the Animal, it seems strange to require that all heroes built around ranged combat (for instance, if you wanted a gun fighter) to have a pet. It would allow the player a real divergent option in how they wanted to build a ranger.
I don't 'dislike' any of the 3 "heavy hitters" but it sounds like you're implying that these are the only 3 heavy hitters. Are more to be announced in the future / can you build your other classes to be focus on single target offense to make up for this?