I can certainly group pleasures into consistent and overlapping categories. Most things that give me pleasure:

• make me feel good about myself
• make me look good in the eyes of anyone else present
• involve giving another person or people pleasure
• involve executing some sort of well-defined skill
• involve some sort of satisfying pattern-matching
• involve discovery of something clever

Anything that isn't in this list which I might describe as pleasurable involves some sort of direct physiological pleasure-giving stimulus (orgasm, chocolate, etc.).

I'm pretty sure that based on this criteria I can predict with a fair degree of accuracy whether or not I will find an activity pleasurable; the more criteria an activity meets, the more likely I am to gain pleasure from it, and the greater that pleasure will be. If a coherent concept of pleasure doesn't exist, what am I predicting?