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Thats a big reason I like them. They are so different. Throw their daemons in there, and you have a sweet army. While the Marines are slower than normal, they can lay down some heavy fire. Where they lose heavy weapons, they gain Sorcerors with powers capable of almost rivaling most heavy weapons.

While they cost mucho points, they are tactically fun for me. I have played a normal marine army for sometime, and these are not like normal marines. They play so much differently. And, adding on to the list of making them awesome...

- Possesed are ALL sorcerors
- Auto pass ALL psychic tests.

And they have a sweet list of minor psychic powers, its surprisingly fun to roll for them and see what you get each game. Its like... opening a booster of magic cards every time. Thousand Sons are over looked by some, including me, which I sat down, and read them over with an open mind.

One fun thing, that would work well against some armies, and would be pretty cool. Deep strike Chosen Terminators behind an enemy unit, like some heavy weapons of some kind. While you cannot assualt, ave a Chosen armed with the Twisting Path. If it succeeds, enemies squad is not only pinned, but also you gain 50 victory points.

And, because all Chosen are sorcerors, and dont get the cool, 2 wounds a model. You can upgrade any Thousand Son marine to a terminator for 18 points a model. Two wound termies for the win. (Made elites if upgraded this way.)

And worried about enemy heavy armor? Just take a Pred, or a Defiler. Anyways, Thousand Sons are a TON of fun. I dont care if I lose a lot playing them, having fun is why I play.

where did i say same as others?

The only thing that really changed is that everyone can move and rapid fire, which used to be the only advantage the thousand sons had (in the shitty mid codex) but I don't really think that that's valid anymore since the new codex came out...I think they're one of the most flavorful 40k armies out there right now.

yes, but now they count as being stationary, meaning if need be, they have 24 inch range instead of 12.

i'm just emphasising that they are UNIQUE and not "the same", as heavyflamer suggested.
I'd suggest some squads of posessed in a thousand sons army.

They're ******** deadly. EACH ONE IS A SORCEROR. And you can give them all daemonic talons at +5 points each. That makes them a force not to be ******** with.

yep, page 59 of the chaos codex states
Independent Characters, Chosen and Posessed Chaos Space Marines
All models automatically have the Sorcerer ability without having to select the upgrade from their list entry. In addition they will automatically pass any Psychic Test they are required to take.
The main list limits Chosen to one Sorcerer per unit, but if the unit has the Mark of Tzeentch, every model hs the Sorcerer ability. Sorcerers may select from the Psychic Powers and Equipment section of the Armoury.

Now, it says that in a posessed squad, all models have the Sorcerer ability. Posessed can't HAVE sorcerers normally. Thus, this means they MUST have an ENTIRE squad of Sorcerers, no?

The what if scenarios that some people come up with, while 'cool' sounding are impractical! People come up with these plots but they are worthless! Indeed, GW would no longer make any money. Besides, 40k is meant as a never ending story.

IF Cadia is to be destroyed, you might as well scrap the Cadian regiments (not the plastics)

IF the Emperor dies, then the Imperium is nothing, it would crumble and fall into ruin

IF the Tyranids eat the current galaxy, then what? Nothing to fight anymore

And the list could go on and on, people are not that bright when coming up with those ideas.