This, but on XBL. Battlefield 1943 makes me feel like a total badass. Also Halo Reach, because it was the first game I played online.

Demon's Souls hands down. WKC was fun to play with friends, all the different quests were fun to do despite the repetative nature the game becomes later...

Halo 2( by far the best memorable experience)

Halo 3

Halo Reach

Gears 1 ( Makes almost a tie with halo 2)

Gears 2

(gears 3 beta, I have been pounding away at)Most likely going to beat out gears 1 If all goes as planned.

Conker Live and Reloaded

COD 4

COD Black Ops-

COD MW2

XBL all the way

Has to be COD4 on the PS3. COD4 on the XBOX 360 didn't feel right, MW2 didn't feel right on either the XBOX 360 or the PS3.

But with COD4 on the PS3, everything was perfect, from the controls to the performance, it is easily the best online game I have ever played.

Yep. I only own one system at the moment.  

halo 2

I've played a lot of them and Uncharted 2 is on top for me. It's by a small margin though.

Gears of War 1 for sure. Over 300 hours. Amazing game storyline and multiplayer.  Gears of War 3 beta is also amazing, and it's not even finished so I really can't wait until September 20th which is also my birthday.  Gears of War 3 or uncharted 3 for the game of the year

The second time, I was playing Fable II and forgot that my Kinect acted as a headset for chat and wasn't thinking when it said to 'check the thing to go online.'

I heard people talking, and someone asked me something and I said, "I'm sorry, I don't know just started Playing, I'm a Noob."

Someone said, 'Who said that.' and I confessed and they ran over to me.  I thought they were going to yell at me, but instead they gave me like 13,000,000 gold.

I was like, "Yea! I'm rich!" and bought all sorts of stuff, like everything.

It was fun.

tekken on 360 love that game i renew my gold for that game lol.