MS - 4
EA - 1 
Ubi - 3 
Sony - 3

MS - 4
SONY - 3
UBI - 3
EA - 2

Microsoft : 3/5
Sony : 3/5 (would have been 4/5 if they were not screwing 8 millions Vita owners)
Ubisoft : 3/5
EA : 2/5

I wish Nintendo will save this E3...

Based on your description of the points I have to say

MS: 3/5 (the show was good, very solid, but it really didn't have any surprises for me)
Sony: 4/5 (the show wasn't necessarily better than MS's, but my expectations for it were alot lower since the internet was really dooming that event, so they definitely exceeded my expectations)
EA: 2/5
Ubisoft: 3/5

Sony - 3. Seems unfair to tie with MS though, because MS was better.

EA 1/5
Ubisoft 2/5
MS 3/5
Sony 3/5

Microsoft: 3
EA: 2
Ubisoft: 3
Sony: 4

EA: 1
Ubi: 2
Sony: 3
MS: 4

Going by the system in the OP

MS - 3
EA - 1
Ubi - 3
Sony - 3

Sony - 4
Microsoft - 3
Ubisoft - 4
EA - 3

I was going to go 2 with EA, but I think (and everything I know about EA tells me I am wrong) that they may be turning over a new leaf. They seemed to care about the games they were publishing and so they earned an extra point. Sony's was the only conference that contained genuine surprises for me.