And yet, no matter how you position them, a Fenris will almost invariably be able to take out an Aten in FS1 and there's no contest in FS2
The Aten would be fixable by increasing turret armor (even at the expense of some hull points) and additional AAA weapons. The Aten actually has decent turret placement, but could use more turrets and better weapons. A beam weapon might be nice for taking on civilian and gunship type targets (Posidens can do a lot of damage to an Aten as is.) If not a beam weapon even a Fusion mortar.
The Fenris, in spite of its comparatively weak armor, is still far more effective than the Aten in every way in both games.
The Mentu is an excellent distraction. It doesn't have the firepower to be a serious threat to anything, but it can take down a few bombs, and absorb quite a few more. It can't really take out a competent player by any stretch, I'd take two Leviathans or an Aeolus over four Mentus, which I would take over eight Atens, when it comes to anti-fighter ability anyway.