Culex was pretty tough if you made the mistake of facing him the first time you made it to Monstro Town in Mario RPG.
Super C for NES had such an easy boss. You can basically get away with going all the way up to it and shooting diagonally upward until it dies. You just have to remember to shoot the occasional blue thing that falls from overhead, provided it doesn't end up getting taken out crossing though your line of fire on the way out anyway.
I don't think the final boss of the NES version was anymore difficult. You basically just throw an apple jellybean at the blob to turn it into a jack and it knocks over some vitamins killing the final boss. Now getting to the final boss... that's a whole different story.
i felt Resident evil revelations 2 last boss was too easy.. course it was on easy mode but i dont see much of struggle other then ammo being the issue.
NIER. One of the reason that this game (despite being one of my favorite on the system) got piss poor review was the fact that you could be beat all the bosses by just using magic in within a minute. You could use your sword and get upgrades and all but the best weapon would do a fraction of damage of your best magic attack (the fist attack).
-Bowser in any of the New Super Mario Bros. games, especially if you happen to have a Mega Mushroom in reserve in NSMB1. -Bowser in Super Mario Galaxy 2. -Yuganon in Zelda: a Link Between Worlds, provided you're not doing a 3-heart and/or Hero playthrough. Certainly felt less difficult than Ganon in Link to the Past. -Ganondorf in Twilight Princess. An absurdly long battle, for sure, but easy nonetheless. -Dracula in Castlevania: Symphony of the Night. You REALLY have to go out of your way to not be well leveled nor have any viable equipment by the time you reach him. (Just off the top of my head, viable weapons include the Crissaegrim, Shield Rod, a level 50+ Sword Familiar, a Duplicator and various one-use weapons, two Fists of Tulkas, the Alucard Sword... The list goes on.)
Sonic CD's final boss is ridiculously easy. You can tell they just ran out of time and threw something together ASAP. The more love NiER gets the better. It's a masterpiece.
Especially if you drained all of your ammo prior to fighting him or her, depending on your ending. The game pretty much gives you the win.
The last boss in Baten Kaitos is a complete joke on purpose. He can actually heal you by doing negative attack damage. -doulomb
Oh man. I remember when we were kids, about 2nd grade, nobody in our age range that we knew had actually beaten that game. Most hadn't actually gotten to Ganon. My friend down the street called and told us he finally got there but really didn't know what to do and just got lit up by the fireballs. I came over and just poked around with my sword and eventually he was red, shot him with the silver arrows and he was done. Since we'd all had that game for a few years (it was '93 I think) everyone was just like HOLY SHIT!!! The boss itself was so easy but nobody knew what to do. To the point where people called me over to do it at their houses because they had never seen it done. Great game. I'm gonna have to give that a playthrough soon. I'm gonna add Zelda 2 to that list. That's one that we all tried like hell to complete and I was the only one who ever actually did it... when I was 19-20. I do kinda wish they didn't make it so you could crouch in the corner and slash until he's dead. A bit of a downer having that be so easy after working so hard to get there.
Oh ye he is. I just wish that loophole was closed. I may not have the triforce next to my name if it was, but if I did it would mean a little more.