I will be the dissenter, has to be one in every crowd right?
To me the Hanse piles on several big negatives into a single design. I love the Plasma Rifle as a weapon for armor as it gets the big 10 point hit for lighter than a UAC/5 (technically 2 5s), safer than a UAC (no jam or ammo boom) and has many non-mech target bonuses. I wanted to see a Saladin refit with it or perhaps on a Regulator- alas it was left to my merc's refits to get that sort of chassis. See a trend? I think the Plasma Rifle has to go on faster units which have a better chance of dictating range because 15 hexes is IMO a bit short for a main gun. You see the contemporary heavy tanks mounting weapons like the LB-10X, Gauss Rifle, Light Gauss Rifle, PPC of some flavor or ERLL as main guns. Which means I think it will be taking more fire, possibly causing it to slow more than the burst can overcome to get into ideal range.
Slower armor tends to get flanked IMO, especially since hitting it in the sides slows or stops it. The Hanse does have a burst option but it move the standard heavy tank speed. While I do like, want more of, and heavily use the Tank Destroyers I think they are better as smaller vehicles (under 50t) . . . the Predator is a good example IMO. A bit faster than possibly needed but that speed allows for the all important facing changes. With the burst the Hanse (non)MBT hits 8 hexes, which long 5/8 vs 6/9 mech discussions debate the extra hex for movement facing purposes.
For the late 50's a new frontline designed tank could be expected to mount FF armor. By 3100, for a tank that NEEDS to be in range of the enemy to get its own hits in, lacks a turret and is not really to subtle a hammer . . . not using HFF to get the most armor points for the mass is a bad IC design choice. I have not examined the sheet (as I do not have it) to see if it was a crit forced choice but . . . I would gladly exchange a LMG or two for the crits to make it HFF.
So IMO the SP Gun is too slow for its main armament and if it stays at that speed lacks the turret to protect itself or exploit its armament. While the armor is not spread thinner by the turret as someone pointed out, lacking HFF IMO it is under-armored for it's designed purpose.