Hello there, to be honest as a fan of League of Legends, I find Janna to be a very strong solid champion by lore, character, and story wise back then when she was an orphan backed and yeah I know there are a lot of people appreciate her a lot back then and considered a fan of her and to me, I feel like I'm playing a summoned unit from Final Fantasy as a playable character rather than a "summoning unit" which is brilliant and it did fit her I believe and at that time I was strongly interested on her from the competitive overall stories from the likes of Ahri, Garen, Sona, Twisted Fate, etc with a few monthly updates back then and at one point asked myself wait...is Janna suddenly friend's with Lux??? and that's how you make a compelling intriguing lore. (maybe some of you guys don't find it realistic that way but I know there are people who appreciate her lore) The only thing I didn't enjoy though back then was how they make fun of her previous stories back like dating a summoner in the old Journal of Justice Files in Blitzcrank dating service but that's just a minor dislike I guess cause it's unrealistic. Nether the less she did make a strong impact as a champion I believe and she's just being overshadowed by many fan favorites from the likes of Ahri and Jinx.
But judging from her current changes in her lore I had a bit of mix feelings from the way they change it and to be franked I did see a lot of people complain about her new splashart back then that could be a factor and looking at her right now I feel that she's becoming an underrated champion nowadays due to many new champions and other global changes that affect the whole verse (and I believe this can be a factor and I know RIOT seems to rework each of them one by one but who knows...maybe they'll rework her one day) and come on, she's often used in most of the tournaments way back from 2009 and to 2015 (I think she's still a popular choice though to the present day). These dramatic changes strongly took happened around the end of 2014.
TBH, I have nothing wrong of Janna becoming a deity some sort like a sudden saint from nowhere but they better make it interesting like how she become one and I already find her old lore back in 2011 compellingly good. I have no idea what kind of directions are they pulling into Janna nowadays but these factors can be hunched by how the community thinks of her, no not just her but the whole League of Legends in general, and parts that could possibly overshadow a lot.
That's my overall past and present time perspective, opinion and appreciation about Janna these days. and nether the less she'd still make a huge impact on League of Legends.