Did you buy a new or used Martin?
How much time did you get to play it before you bought it?
The few I've played were really nice guitars.
I am returning to answer this comment. Why? Because it’s important people see this. I bought a composite Martin. Brand new. Apparently, it’s supposed to be every bit as good as Wood. Well, it’s not. It was total, shit. Just returned it got a fraction of what I paid for it and got a Taylor mini Koa in the same price point. A much better guitar.
Composite might be garbage or you might just have gotten a dud.
I know other people who've bought a top of the line instrument and for some unknowable reason that particular unit was stillborn.
A professional woodwind player who comes in the shop told me about his friend who purchased a $10,000 flute that is a model everyone who's played it says is awesome but which for that particular instrument sounded like student level garbage.
But maybe composite is trash. The first guitar I owned was an ovation (rounded fiberglass backed) which I received for Christmas. Holy hell did that fiberglass back make it sound terrible.
Also, I know those ovations well. In high school everyone liked them because they were loud. But I couldn’t agree with you more, they sounded really thin. No heart; kind of synthetic.
When I walked in and the tech saw the guitar I was holding he said, “I know exactly why you are here.“ Apparently they are garbage.