At the same time however, they know that candidates will be applying to several positions both within their sector and in other areas. By expecting you to know a bit of background (don't read out the Wiki page to them

) they are looking for evidence that you've done your research and have their company as one of your top options. It's not completely unreasonable that they don't have to pitch themselves to you; when applying for big companies most people know (roughly!) what they do and all the information is available on their websites, in the news, Wikipedia etc.
Interesting how different interviews can be though. I've just been through two telephone interviews for people operating in the same sector; one was an hour and a half and pretty in detail, whereas the other was only about 25 minutes. Passed both of them so doing something correctly, but I couldn't see how the second company could filter out candidates given that they didn't really ask an awful lot!
It was quite similar for me. In this case it's software engineering, so I don't know how different it's going to be to other positions as that's all I've done.
1st. Was just a hiccup, phone call to ask a few questions and that's it (It's a company I have previously worked at) -
OFFERED
2nd. Passed CV filter, did online programming tests then was phone interview (lasted around 40 minutes) fairly technical although nothing major, followed by assessment center which lasted from midday to 5pm, consisted of 2 interviews (one technical, one business oriented), and 2 practical sessions. -
DECLINED
3rd. Passed CV filter, again phone interview (lasted over an hour) broad range of areas, followed by interview at main offices in London. -
OFFERED
4th. Headhunted via LinkedIn, online test, phone interview lasted around 45 minutes, broad range of questions, nothing too technical. Skype interview (camera) technical oriented as well as business questions (lasted just over an hour I believe), assessment center consisted of dinner night before with other candidates, sleep in hotel, leave hotel by 8:05ish then day lasted until 4/5. Consisted of role play meeting with a manager, role play presentation with executives, technical interview and group exercise. -
OFFERED
Number 4 was the most vigorous and tiring, but the most exciting and fun because at the point of assessment everyone knew each other (to some extent) and since there were enough positions for everyone it wasn't a competition.
What you will find though is these take a lot of your time. In most cases I had to travel from Durham down south (London/Ipswich) for many of them.