See, this kind of opinion isn't helpful. Basically you're saying, "Its our way or the highway, sod off." D&D is a game about having fun and exploring other roles in a fantastic setting. Why should I be limited by the system to play a character that I don't want to? Sorry, but playing an interactive, dominating, frontline character is not something I always like to do, and I think that people need to respect that opinion. The system should be able to support both sides of the coin, if they wanted.
But then again, 4e is among the most elitest-producing game systems I've ever seen.
So, since you shouldn't "be limited by the system to play a character you don't want to", then the system needs to allow you to play any sort of character you want?
Logically, if there is ANY specific character which is the only character you want to play, then the system MUST allow you to play that character, or you feel the system is failing?
Completely seriously (but hypothetically): I don't want to play a character in a medieval fantasy world. I want to play a high tech giant robot pilot. Does D&D force me to play something I don't want to play? Yes, according to your standard, as it forces me to play a fantasy heroic character, and not a Mech pilot. Thus, D&D is bad, according to your standards.
If "play D&D if you want to play D&D, and play Mechwarrior if you want to play Mechwarrior" is elitist, then color me ELITE.
D&D has never, ever tried to be a universal RPG like HERO or GURPS. If you seriously think that "the system" shouldn't "force" you to play the types of characters the system was designed for, I think that you should either swap systems, or just get used to hating the game.
Even if you grant that it is a game for exploring "other roles in a fantastic setting", that doesn't mean that the game must allow you to explore every particular role in a fantastic setting.
If an individual group is happy with having a loner who dominates combat, then that is totally up to that group. It's not a "bad" choice, but it is a specific choice of play styles. D&D expressly states up front that balanced team play is a design goal. Why play something expressly not designed for your style of play? If you want to play a game with ranged combat, do you pick chess?