The amount of star power they have is entirely dependent on what region the person watching them is from. To a European player, a lot of the NA stars completely lack star power, while a lot of the bigger EU players have plenty of it. If someone is in your region you'll care more about them and find them to be a bigger deal, which is basically how people define star power - how big a deal someone is.
Don't know about boring teams, to be honest I'm finding both NA and EU to be very dull right now but can't comment on Asia. I like the EU casters though, they don't get the awkward nonsensical banter you see with NA and the analyst desk are just generally more interesting to listen to.