I liked all of them. Inezh was awesome. And the guy that played Barry i feel like perfectly embodied Barry, even more than REmake and Revelations 2 Barry.Capcom pretty much grabbed whatever American/Caucasian actors happened to be living in Japan at the time to get them to be a part of the intro video. (source below, look towards the end of the vid)
The physical actors appeared in the credits under simple aliases: 'Charlie' as Chris, 'Inezh' as Jill, 'Grégory' as Barry, 'Linda' as Rebecca, 'Jason' as Joseph and 'Eric' as Wesker.
The real identity of 'Inezh' is Dublin-born actress Una Kavanagh, who has since appeared in TV shows such as Fair City and The Clinic. I believe she was also the voice for Jill in the original game. http://www.imdb.com/name/nm1418006/
As for 'Charlie', 'Linda', 'Eric' and 'Jason', I have no idea as their full/real names or their activity after Resident Evil. However, 'Jason' has previously acted in a 1995 video game Angel Devoid: Face of the Enemy as Mr Digit. 'Charlie', 'Linda' and 'Eric' did not provide the voices for their respective Resident Evil characters (I have no idea if 'Jason' also voiced Joseph or not), however, just the physical portrayals in the opening intro. In the English versions, uncredited actors Scott McCulloch was the voice of Chris http://www.imdb.com/name/nm0566124/ and Sergio Jones http://www.imdb.com/name/nm0016015/ was the voice of Wesker. Both have some minor roles in other media - e.g. Wesker was in Baywatch!! Lynn Harris was the voice of Rebecca, and she has been in many different video games http://www.imdb.com/name/nm1188121/ Rebecca's Japanese voice actor was Reiko Takagi who has appeared in Bleach and other anime http://www.imdb.com/name/nm0847074/
The real identity of 'Grégory' is Barry Gjerde, a Norwegian actor. He has also been in many different games, I don't know whether or not he also voiced Barry Burton. http://www.imdb.com/name/nm1404097/
Ward E. Sexton was the title caller/narrator for Resident Evil and Resident Evil 4 http://www.imdb.com/name/nm1408728/
Hope that's helped!!