Itagaki just wanted all of his games onto Xbox. Also alot of things are missing because its Dead or Alive 2, and not 3. Itagaki hasn't said anything about making DOA3 online though, but I don't want to play the unfinished DOA3 I want to play DOA3.1 or DOA3.2, everyone has better frame advantage on DOA3. Its more in depth like how tekken is.
In DOA 2 there is no wall game, but you have slope moves, and the new countering system which gives a great amount of depth, but not as much as DOA3 had even though the moves in DOA3 are sort of easier to pull off in a way if you look at it like that. In DOA 2 Tengu was originally already there, well in the Hardcore version is when they made him selectable, but either then that they also added Hitomi well ported her over from DOA 3. Itagaki was the one who wanted Hitomi to come over because he "likes" her more. I personally like Christy more, but it would've been best to put the top tier character Hayate in there since Ein who is Hayate realizes who he is when you beat him, and becomes Hayate well announces who he is, but instead he wanted Christy.
However yes playing from Europe would be really hard for you, but there are alot of Europe players that are on I am sure you would be able to find alot of good games with people.
Anyway heres a site you could go to to further help you find out more about DOA.
http://www.doacentral.com/ A big community of DOA fans.
Btw on Xbox Live my tag is Perfect Legend, so you could find me on there if you want a game, or something, or want some pointers.