i wont call it gloomy but MCH seems to be labeled as support class with BRD as your rival (and in the future, dancer). and in term of support many people seems to choose BRD because it offer more support than MCH. and there is also these "atmosphere" that MCH seems to be "left behind" compare to other class, not totally ignore by dev, it just... "its here for the sake of variety" kind of feeling. because of this, MCH is like a class who rarely get spotlight.

if you dont mind with being a class that give you some sort of "that guy who always in the corner and rarely get called or noticed" feeling. then by all mean, play it. MCH is undoubtedly a fun class, personally i found MCH is easier than BRD because BRD is very "busy" class (a lot of things to look at)

for DF raid, nobody care so you shouldn't have any problem with it. for high end raid however i cant say because iam not into it, but if they have competent/solid BRD in their group, there might be a chance that they will decline you iam afraid.