Here's how it works. A anon comes along and post a picture and description of a gadget/weapon/or whatever that they think is impractical. Then another anon comes along and explains why it wouldn't work in a practical sense, or why it actually would work in a practical sense. To start us off, the team fortress 2 sentry buster.
A sentry buster? You mean that mine looking thing on legs? Well I guess it would be best for taking out tanks and buildings, but hard to make and not very subtle...I mean look at that thing! You can see it coming from a mile away and it has no camo. So it would likely be destroyed by enemy soldiers before it reaches its target. Even if it did have camo that thing has glowing bits and is likely remote controlled. You would need packs of these things but that would be very very expensive...
WH40K is the king of insanely impractical designs, I'd like to see anyone try to practically explain how Ork tech can function at all realistically.
I'm curious about this, would it work?
With today's tech likely not. It would be going to the battle field like a drunk man on rollerskates on a newly waxed floor. I imagine not very well...so no. But future tech might work, how the shield it is wielding would only be able to protect half of his face, its legs would be vulnerable and if it covers that it's chest and face would be vulnerable. And the fact it would likely hold it sides judging from the pic that's also a tad bit useless.