Medal of Honor: Frontline had a disappointing last boss. All he did was jump around in a uniform and shoot an MP40 - it took one bazooka hit to kill him off (if you played easy), but still - no laser vision? No invisibility? Dang.

Diaper Man ... err ... Gill from Street Fighter III.  He can resurrect himself.

Final fantasy XII was very disappointing - Vayne had three incarnations and all you had to do was hit and heal hit and heal. I didn't even use any chain commands =/ And my characters were all level 50-2. Dull and anticlimatic ending too.

Hm.  I think the final boss of most Mario games is always a nice balance between challenge and fun. 

How about Mike Tyson (or lame-ass Mr. Dream) in Punch Out for NES?  Heck yeah. 

FFVIII was sooo hard.

FFT wasn't that bad.

I found FFX boss pretty easy...was it Yu Yevon or something?

@Dobserver@xanga - Yup... YuYevon, wasn't that bad of a boss if it wasn't for the break damage limit.

RPG ::  I think the final boss from Xenosaga was pretty hard, I don't really remember tho.
Action :: Ninja Gaiden with your eyes closed
Driving :: the original midnight club...that last driver gave me a good challenge
Fighting :: Dead or Alive 3 deffinitly or Killer Instinct
Shooting:: maybe Resistance-FoM on superhuman?

I havn't faced a tough final boss in a while. Now-a-days it's all about optional bosses. Lets give the final boss 99,999 HP and lets give an optional boss 25 million. (in reference to FinalFantasyX) Why not? In my opinion it might be because just in case your not properly prepared and you get to the final boss only to find you can't beat them OR go back. So you get angry and smash your console against the wall. But with optional bosses you know they're powerful and ususally aren't in "un-getaway-from-able" places.

I'm playing the 2nd half of FF8 now , so from what I've read, hopefully I'll have some fun. If you want epic bosses and a pretty nice story, and if your chock full of patience I'd recommend StarOcean3 Till the End of Time.

@silentwhim@xanga - lol FFVIII had maxlvl 100 not 99 but I get your point ^^ I on the other hand am one of those ppl who grind to the max. I enjoy crushing the games, not only playing them through.

Baldur's Gate.  I didn't have a problem with any fight on the way to Sarevok, not dying to anything but the occasional trap that I forgot to detect.

Then you get to Sarevok and his goons and....oy vey.  Maybe it's easier with a Cleric casting Zone of Sweet Air, but I didn't have a cleric (played as a paladin, got the Khalid/Jahiera and  Minsc/Dynaheir combos, plus Imoen Dual-Classed to a mage), and even when I beat the fight, I lost every character except my main, and Imoen, who only didn't die because she was terrored and ran away from the fight.

There have been a few games I can remember like that, but that's the one that jumps out at me.

@Swirlingvortexofpurechaos@xanga - yes, it was origonally made for the playstation but they rerealesed it on PSP. It's pretty fun, a two disc game where you get to choose if you want to play as the boy or the girl (Claude, Rena) it has a simular sytem of item creation as Star ocean till the end of time, but I'm yet to finish it so I dunno if the boss if hard yet.

Fable 2 and Saints Row 2 both have easy final bosses.

@brainandpinky - hmm yeah i had like one or two...