I think showing the numbers of thumbs up under one's avatar will generate an arms race (or thumbs race) which will render them rather meaningless.
The best thing about the former "like" feature was that it almost always really meant something. Frankly, with how I envision the thumbs being used as I see it now, I would largely stop paying attention to it. Previously, almost every "like" I got was a meaningful gesture by someone who went out of his/her way to give it. And I only gave mine when I really meant it. This new tool looks like it will just flood the board with "thumbs" that really don't mean much. Even Rulzz "likes" were meaningful. Plentiful, but meaningful. The new tool seems like it is begging for us to thumbs up/down each post. If that is your goal, fine, but it doesn't seem like a good replacement for the former "like" functionality.
Did I just turn into a negative Nancy? Well, you know what to do!