Okay, okay, I'll eat humble pie. Namco Europe actually did do something competent for once.
Aww, cut them some slack! Namco didn't have a European branch until just around the launch of Tales of Vesperia last year. The first thing they did was add content to Dawn of the New World to apologise for the delay. Ever since, they've given us games simultaneously with the US, exclusive limited editions, and even games (like One Piece and Solatorobo) that the US don't get. They also put up all the announcements from Level Up early and clearly with official PR, compared to the miscommunication and "not sure, ask again later" that came out of Namco America.
Namco deserve being told off for not having a Euro branch sooner, but Namco Europe have been nothing but awesome since they came into being. Long live Namco Europe!
The EU Tales of the Abyss trailer is noticeably in Japanese with subs. It's possible that they're keeping the original dub, as that way the other languages will get voiced skits, or they just haven't got footage from the 3DS version in English yet. I imagine it is just for the trailer, but you never know.
I've never played a Tales game before. What's so good about them?
If I had to say one thing, then I would say it is the skits. There are always hundreds of skits, in which the party discuss pretty much everything. They do a fantastic job of fleshing out the characters which is just something you don't see in other RPGs, as a lot of it is stuff that wouldn't really fit in the "main plot". It really brings the characters alive, especially in Vesperia and Dawn of the New World where they're fully voiced.
The battle system is also awesome, although each game mixes it up in some way (Graces F has a completely different system to Abyss), and the stories are normally pretty enjoyable with a few good twists.