Can't say I lost my suspension of disbelief wrt. environment or clothing –the sandy location was really sandy, and you can make basically any place in (non-southern) Europe look like any other place in Europe by changing the lighting.
But yeah, I did lose it when the UNIT special forces couldn't make themselves kill hostile doppelgangers. And when Kate (and that whole UNIT team) somehow forgets to draw her weapon during the Zygon's utterly slow transformation. Seriously, if you want such a stupid* drama scene, just have their weapons jam or be unloaded or whatever, so they go down pursuing their job instead of... this.
It's nice to see the DW-verse version of the current refugee 'crisis' though. Then again, I'm not sure the writers are even going for that, because most of the episode (and probably next episode) is focussed on dismantling the splinter group and it's avoiding all the other aspects of managing immigration.
*It's been done soooo many times on DW and in most cases the victim could've done
much better if it weren't for the script writers
**From what I've read, real drone operators don't get to see faces. An algorithm or other human gets to identify the face and posture, and the operator (who's likely in Europe or Africa instead of the USA anyway) only sees blurred faces and a tag on the target.