Agreed, and I don't mean to say all synths are equal, or that a Casio CZ101 is just as good as an Andromeda or a Moog or a Matrix 12 or any of the "greats." I tend to think of all synths as having their own strengths. For some synths, like a CZ101 or my Roland SH101 (hey, my first two synths both had the number "101"...) one of the strengths is that they're straightforward and easy to learn, so maybe their value is more as learning tools which are limited in terms of practical usage.
Over the years I've seen so many people say "Oh, everybody knows FM synths like the DX7 are hard to program and boring sounding," or "Everybody knows Rom based synths like D50 and M1 sound good, but they're shallow and predictable." I think it's very easy to dismiss a synth this way, and also end up dismissing or ignoring the very great work some people are able to create with synths like these.