I think this tops it all:

lest we forget these awesome controllers:

I actually had the old style Genesis with the Sega CD that attached to the side. Used all these silver plates and screws.

I hated that, caused my Sega CD to not work from time to time due to plate slippage.

Looks more comfortable than this:

The 5200 Trackball Controller was bigger than many consoles.

Some more famous blunders, no descriptions needed:

Lest we forget:

This has to be on the list someplace

That would be #1 for me.

Tiiiiimber!

I'm trying to figure out what all of those are. Master System adapter on top of the 32x, then the genesis cleaning system, then Game Genie, then 2 Sonic and Knuckles cartridges with Sonic 3 on top?

How about the original Mega Man artwork:

High Resolution Graphics? Oh god, what has been always will be, NOOO!!

What would BLAST PROCESSING~!!! be considered?

Or how about Atari screwing up the deal to distribute the NES outside of Japan?

My local Play N Trade had this in their N64 for people to play when I went in today. My nephew started to play it, but I told him to stop, calling it one of the worst games of all time.

Would Microsoft's acquisition of Rare be considered a blunder? I would like to think that since what Rare has produced since being bought versus what they produced before would show that the quality output has gone south.

Any FPS game that doesn't automatically refill your health. I'm too spoiled by great games that do it.

What about...

- Sixaxis controller being talked up before release, get put on the shelves for quite some time, then pulled off the market. The first game to use it extensively(Lair) was utter rubbish. Also, the non-removable recharchable battery gives the controllers a shelf life of about 3 years, after which the user will have to pay up to have the battery replaced. Oh, and the lack of charging cable with new controllers.

- Backwards compatibility feature between different versions of the PS3. This feature was pushed big time pre release saying the PS3 would be 100% backwards compatible, while the Xbox 360 was not. Included in hardware for the initial US release, but only in software for some other releases around the world. Then it was completely dropped all together (Here in Australia anyway) cause Sony wants us to buy the games all over again as DLC even if we already own a copy.

- PS3 without HD cables. The PS3 was touted as a HD device, with HD games and HD Blu-Ray movies, and HD menus and HD photos and HD music visualisations which would all look cool on your Sony HD TV. Except that it doesn't come with HD cables in the box, and it's just not made all that clear on the box for the average consumer whether you need one or not. At least include the component cables.

Don't wanna sound like I'm flaming the PS3 or something, just some recent things I've noticed since I work in retail and sell consoles.
Sony Computer Entertainment has started acting like a big greedy corporation ever since they figured the Xbox 360 would be a major competitor for them. They didn't seem as irrational when the PS2 was #1.

This list sucks, but at least the pics posted are great

This list sucks, but at least the pics posted are great

To counter balance, you could have mentioned one of the xbox360's major flubs this gen, including but not limited to: THE RED RING OF OMFG DEATH!!@#!, $100 20 gb harddrives, $100 usb wifi adapters. (I heart my 360 and use it way more than my PS3, but there are some obvious deficencies there. That said, yeah, Live still rocks and there are a dozen workarounds to both the hdd and wifi issues. But still, Red Ring? Microsoft, what the hell. Only they could find a way to port the BSOD to standalone hardware.)

I go gaga over video games featuring hot babes and not much else. I'm a straight male, what else do you expect?

RROD yes, the other two? I don't think so. They are things we don't like but Microsoft didn't blunder there. I'm sure they are having a really good profit.
Rare has been mentioned. Maybe, still in the air, NXE and specially avatars.