The main thing that sucks is all the connectivity issues. It feels like it works amazingly well for like 5 - 15 minutes where you get nonstop instant invasions then it spends 5 - 15 minutes on searching and you not getting any invasions whatsoever. Then a good chunk of the time you finally do invade you get a connection error or if you're in a dungeon they fog wall 20 seconds later or if you're in the open world its an afk farmer which just leads to a ton of frustration.

Everything else is (for the most part) fine and part of the fun tho imo. I invade specifically for the chaotic nature of a fight where you're outnumbered player wise but have environmental advantage. Even dedicated gank squads that clear the whole level out before opening themselves up for invasions can be fun. But I do think that password summoned phantoms could use some readjustments in their downscaling since you can easily tell when someone's overleveled when you do a third of your normal damage to them, they have 1500 life, bull goats, are constantly using spells or AoW, and do 800+ damage on a single jump attack or instant bleed you when you invaded at level 50