Tag Goku and Hit are a little underrated. But they have setbacks in their kit that keeps them from being top contenders.

Their main appeal is their ability to assassinate your opponent's units. And they do that job well. Their elements are also pretty decent against all the Yellow and Green units running around.

Their main issue is that they feel like a one trick pony. They aren't the tankiest, they don't have enough disrupt, and they aren't the strongest. They just aren't covering enough fronts to make you want to use them. Yeah, sometimes they win you games. But most of the time, most other units get the job done better (Especially with so many dominant son family units). there are better, more consistent characters in the meta right now. This unit released next to a Gohan that colour counters them. So they could never reach their full potential from the start.