I agree with PenskeGuy, I like it that Kisslicer isn't 'interpreting' my model and is pretty absolute with slicing. That way you won't get unexpected changes / artifacts in your slices. I admit it takes some time to learn how you have to output your models from the modeler, but that pays off because you -yourself- have control over the complete process and not some fuzzy algorithm in the slicer.
But Kislicer is developing as well: now it's able to recognize different meshes within the model, and slices them correctly: even when meshes are sharing surfaces (triangles) it's now capable to make distinction between them. As I output architectural models (were for example, walls and floors are sharing the same surface) that's a huge improvement for me.
But that's only when printing own models: for that occasionally Thingiverse print, I have encountered many times Kisslicer is trowing in that many errors, that it's not printable. A couple of that Thingiverse models are that bad, so that even Magics (=$2000 repair program) couldn't repair it.
I simply use another slicer for that: Slic3r has a fairly good stl repair option and does a great job for interpreting single wall's in a model for example (but is slow). Cura has it's own repair options (on Gcode level) and is fast. The new CraftWare has the best (auto)repair with the (bad) stl's I have tested, and is ultra fast (yes faster than Cura and Kisslice), but (although I was very enthusiastic at first) the rigid support structure isn't doing the job well. (it takes a lot of time to manual adjust them). Simplify3D has it's own repair module, but -as far I can tell- it's on the same level as the free version of Netfabb.
I can imagine that, for users who are mainly interested in printing downloaded models, Kisslicer isn't the right choice. For a more general use Kisslicer could benefit by an option to be more forgiving about bad stl's, as long it stays an option we can turn on or off.
Or we have to accept that there is no slicer that 'does it all' and we choose the slicer that fit's the job the best for a specific model. On the downside: you have to spent more time to tweak other slicers.
Bart