I see my main priority/job as providing information to the readers, not impressing them with humor. (My dry humor never works in text anyway- Glad I'm not the only one who's had that problem. Haha.) But I'm a rather silly person, so I'll sneak in a goofy comment or innuendo now & then if it doesn't seem awkward. I won't try to force the funny, though, if it's just not there.
Anyway, I figure we're all adults here discussing sex toys & more, so it's a bit late to worry about being all formal. So I guess I'd say my review style is "professional-casual." (That's like dress-casual only with writing instead of clothes).