This is just for information. True top depends on your taste.
Don't mind the number of anime of the list. I just took max number of anime from my screenshot.
Removed specials from both MAL and A-P. And took max place from movie series like The Garden of Sinners and Broken Blade
Formula is little bit complicated.
Anime's rating of AniDB is R1
Anime's rating of MAL is R2
Anime's rating of ANN is R3
Anime's rating of A-P is R4
And there are scores called Trustworthy Score.
AniDB's Trustworthy Score is TS1
MAL's Trustworthy Score is TS2
ANN's Trustworthy Score is TS3
A-P's Trustworthy Score is TS4
TS1 = 8, TS2 = 6, TS3 = 5, TS4 = 4
Now the formula is
Made on 2013.05.09
green = sequel
blue = prequel of original
gray = stand alone
yellow = summary movie
My comment on this list:
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All of these anime are very good. But some of them is not so "good".
For example: Gintama' is hilarious. But not 5th best anime. I can tell.
Lagann hen was good too. But it is not so good to be on this list. It was too action rushed while TTGL was not.
Some missing anime are:
Serial Experiments Lain - It is very good anime which MUST be on this list.
End of Evangelion should be on this list.
At least one of Kon Satoshi's awesome works should be on this list
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Maybe I'll make new list per 6 months.

