Planet of Fire has been watched, and with it I've seen all of the 5th Doctor's era. Overall the story was mediocre, but I've seen worse. Ainley is still greast as The Master, and we finally got to see Kamelion do something. I think this is the only time where The Doctor has purposefully killed a companion, and he certainly wasn't too torn up about it. Maybe the 5th Doctor was secretly a sociopath, but we just never got to see that side of him

Peri was fine, she was mostly just walking around and dealing with The Master. Seeing The Master all shrunk down was entertaining. Turlough finally leaves, and much like his whole rune I didn't really care. Overall this wasn't a total dud, but it wasn't that interesting.
So, the 5th Doctor's overall era was...tolerably mediocre for the most part, in my opinion. It had some stand out stories, my favorites being (in no particular order):
Earthshock, The King's Demons, The Five Doctors, Warriors of the Deep and
The Caves of Androzani. The Doctor himself is just kind of there, I like him well enough but he frequently feels way too passive. The 13th Doctor has a similar feel, although I think that the 5th was generally more proactive then the 13th. The companions weren't great. Nyssa was by far the best companion, but she got shoved off early (presumably because the show has issues with writing for smart companions that aren't Romana). Adric sucked and got the fate he deserved. Tegan is one of the worst Classic who companions and probably the biggest whiner, she was just constantly complaining and it got really tiring. Turlough was boring outside of his originally premise of a wanna be Doctor assassin, Peri barely counts as a 5th Doctor companion and Kamelion was barely a prop.
I'd say that overall the 5th Doctor era is my least favorite Classic who era. The 7th Doctor's era annoyed me more but it also had a bit more ambition and "bite" that puts it ahead. Now all I have left is the 1st and 2nd Doctors eras, although I have over 10 stories each to watch from both of those Doctors so it will be awhile before I'm totally through with Classic Who.