Its not just the shape, but rather the shape makes it ridiculous.
Bergelmir has big power core with 45.4k compared to Upholder and Havok with 38.2k.
Bergelmir has big hull with 19.4k compared to Upholder with 17.6k and Havok with 18.6k
Bergelmir has 4 guns and 2 turrets, one of the turrets faces forward so it is actually 5 weapons forward. You can put 2 hellfire and still have 3 EMP forward... Upholder is 4/2 but both turrets are backwards, one less forward weapon. Havok has no turrets at all.
NOW thing about the stupid tiny shape. Big core, big hull, lots of guns, and tiny little ship. Its wrong in every way.