I haven't had an issue with any awful groups, and I've run a bunch of Timewalking while leveling a couple alts since the patch. I'm sure it's largely due to people getting used to their new classes though; not the timewalking scaling itself.
The closest I had was a tank who refused to do huge multi-pack pulls (one of the DPS was demanding it) because both the tank and healer said they were "still getting used to the class changes." That's a rationale I can stand behind, but the DPS who was insisting threw a huge tantrum over it. They held their ground and the run was fast and smooth with no deaths, so crisis averted I guess.