To the OP, you seem to feel there aren't any "tank" builds in game, there are.
You seem to feel that each player has a specific role, we don't. Some folks enjoy
multi-tasking in their builds.
Some one asked a question of you. Have you made it to end game yet? Have you
made it to GH? The Vale?
For someone to critique a game, common curtesy would suggest they have experienced
a majority of said game.
Many people that play DDO subscribe to the game style you want, find them, and enjoy
your game experience. To say the game should become all about cookie cutter roles
would take away from much that DDo has to offer.
Cheers