Do you guys think Hammond/Wrecking Ball is an instant throw pick?

In current meta, yes. Hammond stands 0 chance against the Sigma/Orisa duo.

In some cases he's kind of useful. Assault maps, mainly if you're on the defending team.

If he can touch then he's been useful, ideally you could touch with Hammond in time for most of your team to get back out alive and quickly switch back to a better suited tank if they can stay alive.

Also kinda depends on the skill level. Some people just have 0 idea how to counter him. But that's at really low rank.