I've had the experience of hiding in my tent after a day of hiking, even though there were several hours of daylight left, waiting for the temperatures to drop and the mosquitoes to go away. (I rely on a mosquito head-net when stopped, and Deet when moving, but their constant keening and hovering can just get to be too much.)
So for me a mesh door would be well worth the extra weight and the extra cost. If I'm going to take a tent in late spring/early summer instead of a bivy/tarp (or just a bivy), it's going to be because of mosquitoes.
Order of tent priorities for me, from high to low: mosquitoes, condensation, wind (warmth), rain (sometimes intense, but never long)
The sublite seems to handle all of these, and a mesh door would enhance the first, by making the tent less isolating when one is stuck in it.