Once upon a time, I found Android fun to use.
No, I found it delightful to use. I used to enjoy just swiping through the menus and scrolling through the apps. It was always nice in some geeky, esoteric fashion.
The notification pulldown amazed me the first time I saw it, and the app drawer was a source of endless fascination. Then, 2.0 Eclair came asking, and we lost the funky app drawer, but we got something cooler: the "waterfall" drawer. Yes, this was great!
Then 2.3 Gingerbread was released, and it gained a fantastic new black theme. This was amazing on all our fancy new AMOLED screens, and it made the OS look just that bit more professional.
3.x Honeycomb was next, and although it was effectively a bodge job, it was divine. Google had somehow reinvented Android to work well in tablet form. Sure, it wasn't actually all that great an OS, but it laid the foundations of what was to come next.
4.0 Ice Cream Sandwich is probably my favourite of all Android versions. It was fast and smooth on phones. On tablets, it built on the foundations laid by 3.x.
At this point, Android was still fun to use. Phones were much nicer to use than previously, and tablets were still mighty fun. TabletUI really was a thing of beauty.
Google relegated TabletUI in 4.2, and removed it completely after that. In my opinion, that's also where Android stopped being fun.
In 5.0, they went back to a white system theme, which imo looks pretty poor. The toast notifications became large and intrusive. The notification drawer became slow and clunky.
I no longer use my devices simply to play with the OS. I guess that's a sign of its maturity, but it makes it significantly less appalling for me.
I'm not saying that I'm about to jump ship, just that I've lost the passion I once had for the OS. It no longer seems magical, or even whimsical to me.