I just got Demon Soul not too long ago and also white knight chronicles recently
I must say,both games are quite entertaining in many aspect
If i had more time,i could write a longer review

Demon Soul is what i would relate to the Serious of Serious gamers , you need patient, understanding and tolerance.
Its not a game you go in gun blazing ,or wacking stuff randomly, but if you are an experienced gamer,especially one who has played and survived most of Monster Hunter's Challenges, Demon Soul is just a foot higher.
a easier way of describing this would be taking MH + Magic + A lengthy game + pvp = Demon Soul
Difficulty? : Hard , but i wouldn't say its the hardest , serious , i had more trouble trying to play megaman than demon soul ( yes i suck at megaman >_> )
Would i Recommend you to play this? : If you want a challenge ,YES, if you expect a good story and smooth sailing , Forget it.
White Knight Chronicles has the aspect very similar to Rogue Galaxy from the PS2, i bet most of you never played it, but i can say its an awesome game , can't match Kingdom Hearts 1 or 2,but hell,its one of the game that entertain me for a long time.
so,WKC is a game i would say is for Casual Gamers , you don't need to bang your head against the wall everytime you are overpowered , since there is a knight form,and you pretty much kick every boss *** pretty quickly
the only downside i would say in the game is the time it takes to attack,its somewhat like Final Fantasy ATB Bar, it needs to fill before you can string any combo .
Speaking of Combo,the game is all about it ,if you never set any combos,your quite screwed , except of course your just playing leonard(the main character) ,cause i rather use his points to change into a knight than string any combo.
If you think the game is TOO EASY , then i can recommend you to try playing it without the Knight(unless the game calls for it) . It makes it harder,but not impossible,most fights can be won without the need of a knight.
Heck,even your main char(guy who never talks) can be a tank/melee/range/spellcaster/healer hybrid ,so he can fill any role you need.
Oh yes,there is the online feature,its quite smooth,not much lag at all , i played with my friend,we co-op some mission and killed some trolls and bigass monsters together,it was fun if you have msn infront of you,

, or if you have a usb keyboard
Difficulty : Easy , i would say its not for people who expect a challenge, it works better for people who just enjoy good graphic,large landscape,a somewhat good story(haven't played finish yet) and customize stuff to look like a christmas tree
Would i Recommend you to play this? : If you enjoy RPG ,ya,this game is for you,but its really not challenging at all.
http://www.youtube.com/watch?v=V3NOQ1ONk8QThe Trailer
Well,there you have it,my short review of both games,i couldn't talk much about demon soul during that dinner party cause shawn interrupted me with his stupid Fat Princess game,but i guess if you like a casual retarded game,thats also a good game ,lol
I wanted to write a review on demon soul,so i guess i got my chance,sorry for my really really horrible english,i tend not to correct myself >_<