OK, but not meeting listener expectations does not mean the fundamental design of the speaker is flawed, only that the buyer chose the wrong speaker.
I've heard magico mini but never Merlin.
Even the mini's sounded "thin" to me on an absolute scale, despite being one of the best speakers I have heard in most every other regard.
I've heard higher end Totem monitors in the past as well and they were also quite good as has been similar Dynaudio (not thin).
I have some pretty good Triangle monitors ($500 new) also. These are thinner than 5X as expensive Dynaudio at higher volumes, but competitive with most anything at low volumes.