@ OP It seems to me that you try to make a quantitative comparison where only a qualitative one is applicable.
There are tons of different Infiltrator builds, many of which do not include the Widow.
Autoclave wrote...
Wut? Having slowdown during the zoom in is nowhere near as good as having the slowdown all the time pre-zoom and during zoom with AR.
You obviously haven't abused the time dilation with the Viper on - its broken. No other class has the opportunity to achieve a 100% sniper headshot ratio with a
passive skill and at the same time reduce power cooldown time vs real time (in which enemies shoot at you, you know) ratio.
It seems you try to use the cloak for a damage booster for sniping - that's completely the wrong way to approach the Infiltrator. It's just what it is - above all else a skill to give you unrivaled mobility on the battlefield, and no, hardened AR is not the same and surely not better at that aspect.
If you want to compare eficciency (i.e. speed at clearing levels), there's the caveat that one class/build will always come on top - does that make all the other ones obsolete? The Infiltrator is a gimped Soldier only if you play it like that. So don't play the Infiltrator like a Soldier, play it like an Infiltrator.
Using the Widow as a Soldier might clear levels
slightly faster at times, but the Infiltrators can move around unchecked - there's tactical supremacy for you...
On the other hand, whenever I want to feel some unadulterated "Arnie in "Commando"" fun, I load a Soldier save, slap on Hardened AR and don't let up the Revenant trigger after squeezing it.
Which brings me back to my original point - they are different gameplays, not quantitatively comparable. Brains and brawn, you know...