To me, battletoads only gets "hard" at Terra Tubes (level 9) and beyond (maybe volkmire's inferno as well... but that's more about memorization than difficulty). I really hate to see people complain about level 3, because all that takes is reflexes beyond "down's syndrome child"
This is only on single player mind you, because multiplayer is a ginormorous crapfest considering I've yet to find one person in real life who actually enjoys or knows the game at all.
edit: and yeah, I don't really understand all the hate either, it's really not that bad, and quite fun for a "replay this over and over until you have it down" kind of platformer. And trust me, a LOT of people love those type of games, if only for the feeling of mastery. This is the regular Nintendo board, most here like their games hard.
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