I never liked The Visitation, despite it being OK. And Davison only clearly likes it for that one element at the end of the serial. But like most stuff with Five and Adric, its fairly boring and sags in the middle.
Yeah. I never really got the outright hatred for Adric, but he really isn't a good companion. Nyssa deserved so much better, she's easily my favorite companion on the team right now. But even when Adric dies its Tegan who sticks with the 5th Doctor the longest for some reason.
The Visitation as a story isn't the worst thing ever, but its boring. I'm still trying to build up the will to watch the last episode, if for no other reason then so that I can move on to another serial.