I had a conversation with a guitar player regarding his disdain for china cymbals. His actual comment was that china cymbals should be outlawed and the drummers should have no more than two crashes and one ride. I responded with my typical "for what kind of music?" retort. His response: "any kind." Total disclosure is that this guy was a really good guitar player and fairly well known producer.
It all depends on the style of music, the type of china cymbal and where it gets used. A well known reference would be the china cymbal crash that leads into the breakdown of "Who Are You" by The Who. I think a simple crash there would not have been as interesting and that example is a great use of a china.
There are a lot of different types of china cymbals that, to me, kind of get lumped into two, very broad categories that I consider "crashes" and "rides / washes". Again, these are very broad categories, but I see the crashes as the brighter, faster cymbals and they are usually smaller in nature. The rides have a deeper, more mellow wash to them and are somewhat less aggressive. Again, in very broad terms, those chinas that have a ride quality can be useful as rides or crashes. The crashes generally are not as useful as rides. Just looking through the catalogues these days it seems that most chinas tend toward the smaller crash type.
I have a couple of Sabian O-Zone cymbals to which I have added rivets. I have an 18" with 3 rivets and a 16" with 2. Those really are a great alternative when you envision a china cymbal in the mix and your bandmates or producer are not too keen on them. They are very dark, smooth and washy cymbals and are quite musical. They can be used as quick accents, and still maintain a very mellow and trashy ride. If one were playing "Africa" by Toto and wanted to play something in place of the gong that shows up on 4 on the turnarounds, this is a great option.
All in all, if it works for you and your style(s) of music, then by all means....