What I find most painful is mandatory emotion, whether "high" or "low" -- the "joyful smiles" at JW assemblies just as the loud Hallelujahs in Pentecostal services, inasmuch as they are expected from everyone.
From my JW time (over 20 years ago) I can remember about every type of character -- warm, funny, enthusiastic, negative or dull. Only their expression is somehow limited in official WT settings. Also, the uniformity of the organisation leaves little room for cultural differences in such settings (such as you can see between a Lutheran service in Scandinavia and a Latino-American Pentecostal church).