I've seen it many, many times in Indiana State Parks. Not just motor homes, but TT's and 5er's too. It does look odd. But almost always it because they are traveling with another camper and they are parked side-by-side.
On one occasion, at a county campground located along a river, we had a motor home pull in beside us (door side of our camper). We were backed in, they pulled in forward. Nice folks. But I did take opportunity when the time was right and asked why they pulled in forward.
They said they pulled in forward so they could see the river out the front (windshield), that if they backed in, the view would just be the camper across the road because they didn't have windows in the back of their camper like "WE DID!"... um... at the time, our Springdale had a rear storage area, like an small garage! No window in the back at all. (but the front didn't have a window either). I didn't argue with him, I was just trying to find out why he did what he did. I did make the comment to him, that when he had a moment to take a look at the back of our camper. We parted peacefully, and that was the last time we spoke. They pulled out the next day.
Ever since then, I've noticed when folks are pulled in the opposite, but never made any kind of issue about it.
Funny, when we had our pop-up, we'd turn it all kinds of directions so the door was facing, sometimes toward the back, and sometimes, toward the road. That was the nice thing about a pop-up. Put the wheel on the tongue jack and it could be pushed anywhere! (Kind of miss that, but not enough to ever go back to a pop-up though).