That's a shame:

I bought a D15 here in Australia about three years ago and have found it to be excellent. I had it set up correctly by the store's repair man. This meant medium guage strings, action lowered and bone nut and saddle to replace the plastic ones. The tone and quality improved out of this world and just keeps getting better and better with more use.
Most people I have corresponded with on the Net - via the Martin Unofficial Guitar site and other places - sing its praises.
So do other people who hear it and those (few)I allow to play it.
Martin often sets the action high on its guitars but a good guitar shop will fix all this up to suit your needs.
It really is a light guitar to hold, but its strength is fine and volume very high.
But everyone to their own. If you are not hapy with your purchase best thing is to take it back and replace it with something else.