the problem is the height itself not just the arms if they weren't so tall they would look bulkier overall. I say chop their legs until they are just slightly taller than marines, http://4.bp.blogspot.com/-aJx4ve0q1kY/Ulrw6nks0MI/AAAAAAAAE7k/Mlokcs79CfU/s1600/IMG_7538.jpg chop the meganob's until it's just above the terminator http://4.bp.blogspot.com/-TUrZTZJk5S4/U7yAH5JcO5I/AAAAAAAAnD0/WRpWPtItgxY/s1600/DSCN6707.JPG and straight up scale down the wraithguard until its chest reaches the marine's head. http://images.dakkadakka.com/gallery/2013/6/6/503979-Wraithguard to Space Marine Size Comparison.jpg but do it before animation is done or it will be a bitch to fix later. the pauldrons looked more reasonable in the other screenshot.
No one brings up the Wraithguard? Its head is too small for its massive chest and shoulders.... TBH the mega-nob is the best one of the lot so far.
Not familiar with the wraithguard myself, sorry, I never see them on the tabletop these days and they don't seem to be in a lot of the recent artwork. But yeah, they seem a bit off too, though not as egregious as the Nob and the termy.
Arms look wrong on Terminator, Chest looks wrong on Wraith knight. Meganob will look like it should if you add weapons and less of the ork is visible.
Looks fine to me seeing as these are just hase models with no coloring, shading, or textures applied yet. I'd agree with others if it wasnt for the fact that GW already has a sorta goofy design for termis.
I'm just going to leave this here. Proportions = Fucked. I never realised that Terminators also physically grow to accommodate the size of Tactical Dreadnought Armour.... Oh wait, they don't. Oh BeHaviour....
Well normally only taller veteran marines wear terminator Armour so the height difference is alright. The chest on the Terminator looks too slim and the pauldrons look a bit too big and the arms look to slim also.