Light hearted sure, but actual fun? Compared to the Williams era these titles are dire, imo.
Interestingly the Williams area has been criticized for being too dark and serious as well. And some of the stories I've cited are generally acclaimed as among the best Doctor Who of the classic series - Earthshock, etc. - as were many stories of the Williams era. Just look at the DWM "Mighty 200" poll.
I don't understand why people think Doctor Who should be a comedy. There's plenty of room for dead serious storytelling, and the fact Davison went more in that direction than, say, Colin Baker or early McCoy, was fine by me. And yes I did find those stories fun. All of Doctor Who is fun - it's a show about a guy wandering around in a police box, for heaven's sake.
But the show does occasionally go too far into the silly, whether it's the Fat Bastard ripoff in Love & Monsters or Sil eating his slugs in Vengeance on Varos (which is otherwise a brilliant and ahead of its time story) or the bad guy in Horns of Nimon giggling himself to oblivion. I was very impressed with how the Traken/Logopolis/Castrovalva trilogy not only made for some serious storytelling, but also brought - amazingly - a good dose of hard SF to Doctor Who which is something you rarely saw. Considering Logopolis is built around the premise of block transfer computation (which, apparently, isn't a bunch of random technobabble and could be seen as predicting today's virtual worlds) and entropy. And Castrovalva was inspired by an MC Escher painting.
Not that the rest of Baker's final season didn't have other moments of brilliance, like that vampire episode. I could have done without Adric (though that would mean Nyssa would have probably been the sacrificial lamb in Earthshock), and Romana's departure was too rushed (the novelisation handled it much better). But the changeover to John Nathan Turner's leadership was the right decision at the right time and while it can be argued he overstayed his welcome by several years (someone new should have been brought in for McCoy) for those first couple of years he oversaw some great Doctor Who.
Was it ha-ha funny all the time? No, and that was a good thing. You compare it to the Williams era, and I suggest that, at least for Baker's last year and Davison's first, JNT brought to show back to the era that gave us such classic as, well, Masque of Mandragora (how's that for getting the thread back on topic!)
Alex