As far as I can tell, your disk looks okay. According to that paragon of truth known as Wikipedia, the value is derived from the raw value, and is scaled in such a way that it can be usefully compared to some warning threshold. Then, if value goes below threshold, the idea is that this indicates that your drive might fail in the near-ish future.
Since your value (200) is well above the warn threshold (140), this is good.
I usually just look at the raw values of key attributes (read/write errors, seek errors, uncorrectable errors, the various sector events). If they start increasing regularly, that suggests to me the beginnings of drive failure. In your case, a raw value of 0xFFFFFFFF is harder to explain. It could be what the raw value was initialized to, but then you say that you have another drive of the same model that doesn't behave like this, so... I don't know what to say about that. But the rest of your raw values for the "key" attributes are 0, which looks good to me.