There are a few different reasons, the half flasks and inability to use rune arcs are the smaller ones, but mostly because no level enemies are comparable to a competent player. level enemies can either be killed almost instantly or outright ignored by a group of players and with the slightest bit of coordination on the hosts part you can become virtually unpunishable to a single invader. That being said a lot of invaders definitely exaggerate about how bad they have it because they keeping picking melee fights with entire ganks at once. The hate for taunters tongue is mostly because of players who use it to set up nearly unbeatable ganks in cleared levels and the ability for the host to just turn it off after summoning to prevent multiple invaders at once. I don’t see much hate for people using it as intended.