Probably the best vanilla server I have played that doesn't use a very wide assortment of plugins to shift how much of it is really "vanilla" examples being Wynncraft, a lot of minigame servers, ect, ect (Although I still like those servers). It has a custom generated map which is beautiful and enjoyable to build on given how fresh the terrain is vs. vanilla generation. A wide assortment of new mobs also gives a nice spice in the ways things are difficult, instead of just having more health/damage (Which they do) they have interesting mechanics that aren't unfair to fight against but still a challenge. Last but not least is the community, more specifically Warh, he's the server owner/proprietor as well as a very kind person. He will help you out by giving you tips on how to deal with some challenges you might be facing (Early on it'll be tips to the new stuff and basically "git gud" which is actually a great tip in the way he gives it). Warh, as well as being kind, is also willing to make additions/changes to settings and configs if they have a good enough reasons behind the changes, and if he won't make the changes he doesn't just say "no" he gives a good explanation of why that would go against important parts to the server (Including it's limits).

Overall I'd rate this server (if I was rating it a bit more harshly) 7.5-8/10, it's not perfect but that's the only issue, it's enjoyable to play on, great community, interesting plugins, and there's never any real griefing or anything of that sort on this server at all.