Raspberry Flavoured is a modpack so great that I married the lead developer. You may think that this would make me a biased reviewer, but fear not, for I fell for her due to how amazing her pack was, not the other way around! That's how you know it's good.
I have extremely high standards when it comes to Minecraft mods and modpacks, as I am a game designer, Minecraft is my longest running hyperfixation, and I am a perfectionist, sometimes to a fault. But when I first played RF, it pleased me in a way that no other pack had done before. Mind you, it has been a while since that first playthrough, and both my tastes and the pack itself have been refined for a couple of years since, but even then there was something special about it. And refined now it is, you will not find a pack as cohesive or with as much polish and attention to detail as RF.
Despite its tags, it's hard for me to say if I would really call RF vanilla+, or even vanilla-, as it focuses more on what raspmary believes would be good design, rather than emulating what Mojang would believe to be good design. Though in my opinion, vanilla+ is kind of just used as a blanket term for mods that are intended to be well designed for the game, so it's not exactly incorrect. Whatever the case, this design philosophy is what makes the pack great. There's no arbitrary restrictions, it's well designed, and there is a clear vision; to make Minecraft not suck. Some of my favourite designed parts of RF are the tool progression, advancement tree, crop & fish selection, and general lack of content bloat, though it's very hard to list everything great about it concisely.
The only criticism I've seen for this pack that I believe is valid, and that hasn't since been addressed in an update / is being addressed in a future update, is that it can have poor performance. This has never really been a problem for me personally, but I have seen other people struggle to run the pack. I'm not really sure what could be done about this though, RF has a lot of mods so it's not really a surprise.
The most controversial part of RF is its feature removals. It removes a lot of stuff from vanilla, such as the end and villagers, and guts almost every mod integrated into it. I think this is a great thing that makes the pack a million times better, which shouldn't be a shock at this point of my review, but I do understand that it can be hard to accept for some. Personally though I think the pack doesn't remove things enough! I would love to one day see Create gutted of even more features, but that would take a lot of work.
Ultimately, RF is a modpack for people who like to take the game slow, and for those who are cursed with the knowledge of how to design a game good. There's nothing crazily flashy or out of this world, it's just a version of Minecraft that is cohesive and passionate. And passionate about it I am, it got me a wife after all!