But you have to discern the amount of content and the nature of the content.
On paper, yeah, Femshep has more numerical LI's.
But look at how most of them turn out:
James is really a fling during the Citadel DLC; more appropriately, Shepard gets really drunk and borrows his penis for the DLC.
Jacob cheats on you and is completely closed off, even if the game implies that he still has feelings for you (actually, Dr. Cole explicitly says that Jacob still loves Shepard), which is full of all sorts of unpleasant implications (Jacob, the black guy, ditches you for another woman and knocks her up, but is implied to still be in love with you, which may potentially lead to him ditching his baby momma to get back with you). But past that, yeah, Jacob got iced as a character.
Thane gets some decent romantic content (IMO), but ultimately ends up as the deceased LI, cutting off that branch.
Javik is a flat-out joke 'LI' that was added more for humor than romance in a DLC(similar to James, although there's at least some semblance of courtship with him).
Samara gets some nice content, but it's a DLC bonus with some UST that will ultimately never lead anywhere. You really can't call her an LI.
Kelly is basically an ME2 consolation prize, the hot assistant you had that you get to take advantage of if you have no one else. In ME3, she all-but disappears from existence after, with no content past a kiss and walking into a shed.
And Allers isn't an LI so much as she is a fling. It's been stated that it's not a serious relationship at all, just a mutual attraction that turns physical.
A lot of these can't really be called Love Interests in the sense of the word here. I'm not going to argue about the problem of inequality here (I'm a Male Shep player who exclusively romances Miranda with a few female liaisons on the side prior to that (and more if Miranda is willing to experiment), and I'd say the best possible LI for Femshep would be Male Shep.) I'm just acknowledging that it does indeed exist.