Just noticed Dave has made each member's received Thanks visible to everybody.
Good or bad ?
You mean the number of thanked posts, displayed on the user's profile summary page? I am pretty sure this has been visible for years.
I rarely look at it, but sometimes I do -- e.g. when I find someone's posts irritating and ask myself "is it just me?". Usually a rather low thanks-per-posts ratio confirms that others did not find too much value in thoses posts... So yes, I find the information useful (occasionally).