Not true, im sure there is plenty of honest opinions here, however, probably not any unbiased opinions.

my two cents, dont ask the internet for advice on anything.  Make up your own mind.

I have the HD twins so I can definitely feel you. From what you say and the games you have listed, you seem to mostly play single player games. But the 360 is meant to be a MP console and most MP games if not all are better on it because of party chat, better porting, etc. Plus the exclusives on 360 are also geared heavily towards MP players.

Personally I play all my MP games like COD, Halo, etc on the 360 while the PS3 lets me play JRPGs and other exclusives. So having considered all of these factors, I think you should probably sell your 360 as it is unlikely to serve much purpose to you. Any future exclusives that may come out on it are likely also to be shooter or MP kind of game, so you'll probably not lose out on anything you are interested in.

I wouldn't even sell a DS if I had a DS Lite. Anyway, you're a grown man. You can make your own decisions. If you only have time for the PS3 and you're positive you won't miss the 360, do what must be done.

Yeah its Monster Hunter Frontier but only available in Japan though :(

You've pretty much already made up your mind. Sell it.
There's nothing on 360 coming in the near future that would interest you. Only a new Gears of War and you don't like shooters......

Do you like Minecraft? There are some good XBLA titles.

That's just not true. Xbox 360 isn't any more of a MP console than the PS3 is. This isn't 2006 anymore.
Funny how you say that you play all JRPGs on PS3, when the reality is that there are tons of exclusive JRPGs for 360....

The only difference between Xbox 360 and PS3 are its excluives games. The online features and stuff are virtually identical. Xbox Live isn't the selling point it was back in 2005. PSN has caught up, and for some, even surpassed it.

I have played almost all the of 360 exclusive JRPGs-Magna Carta 2, Tales of Vesperia, Infinite Undiscovery, Star Ocean (it was exclusive for a while I think), etc but these were published quite a while back probably when publishers didn't realise 360 would tank so hard in Japan. The PS3 has overtaken 360 as of late and Tales of Xilia 1/2+Ni no kuni in the future (One of the main reasons I got a PS3). Plus PS3 exclusives are much varied than 360 ones or at least that has been the case recently. There are many SP oriented exclusives as well as MP ones.

Plus feel free to disagree but in all practical intents and purposes, multiplayer gaming on the 360 is a better experience than on the PS3 from what I've played. Thats not to say that PS3 can't do or doesn't have MP, but 360 is just a better experience all around.

The experience is better because of two things:

1. Cross chat

2. Gears and Halo are two of the best multiplayer games to come out in a while.