Of couse we should work out for ourselves why some other moves
are not flavour of the month.
Best method is to play it against someone.
What may be deemed as breaking even at GM level may suit us
perfectly for the type of game we may be after.
Also if you follow GM theory then you will almost certainly end up with a
postion that only a GM can play.
Their slight plus for White can easily be turned into a big plus for Black
after a few pawn moves or a faulty piece decision.
If you must look up their games then you may be looking in the wrong place.
This postion is mainline Two Knights Defence.
Here (still in the Two Knights).
The RHP 1400 Database has the following continuations.
Bb5 147 times
exf6 15 times
exd6 11 times
Bb3 3 times
Qe2 2 times
Poke about in there and see some of the other replies you can expect
at our level. Who knows you my discover an off beat try that looked OK
and perhaps with a bit of polish maybe worth a punt.
Don't go by the % as these can be very misleading.
For instance this game which came from the postion you are asking about,
(White is the topical Drunken Morphy)
Black is hammering White but Black resigned a whole bunch of games
in Jan 2009. This was one of them.
White won this (well Black resigned).