Maybe they're not caring for it to the same standards we need, but the fact was during those London games at the start of the game the pitch looked in good condition, by the end of it it did not. It wasn't a matter at the end of going around replacing the divots and feeding and watering for a week till it beds back in - it was going to need totally reseeding/relaying in many areas, esp along the centre of the pitch. And you're supposed to stay off areas like that for a few weeks after to let them establish properly which just isn't going to happen with two teams sharing.
Rugby is different in that scrums are more spread out around the pitch compared to NFL snaps so the pressure is more spread out but it is still a more damaging sport for the surface than football, hence why they leave the grass a bit longer for rugby on the whole. So maybe they were doing what we asked for and cutting it shorter for the football, but then that just let the rugby churn it up more, esp when they played the day after us? Perhaps having them play first like last season is actually better as they can keep the grass longer for them then cut it after for us?
Also the ricoh pitch is in a hollow so the likelihood of frost/dew and poor growing conditions increase making it harder to look after than places like Reading and Swansea?