Combined with the fact most of the ranged weapons suck ass to use this is really painful. The bolter in SM1 was a dependable all-purpose gun that could take down weaker Orks with a few shots and soften up heavier ones, the storm bolter was a buzzsaw, the grenade launcher was great for mobs, the melta gun melted whatever was in front of it, and the plasma gun, stalker, and lascannon all had their uses. And the bolt pistol and plasma pistol were also solid backups that could hold their own when used skillfully.
Now in SM2 they're all just some form of over-tuned bolt weapon that has massive bloom and recoil or poor fire rate, and in the case of the standard bolt rifle it has both.
Oh, and the melee weapons were all far more deadly than in SM2. The chainsword was a solid all-rounder and the power axe was as devastating as you'd expect when wielded by a veteran, and the thunder hammer obliterated everything in its path. Meanwhile in SM2 you've got Tzaangors stopping thunder hammer blows with their bullshit shields.