MrGray, is English your first language? I only ask because I am having some difficulty understanding this post. That said, I'll do my best to answer your questions.
what is it with the gauss rifle stuff
you have to be nearly super man to carry
Why do you say that? There's no weight listed for the item, and encumbrance is entirely based on your armor. Realistically, I wouldn't let someone pack a Rauss rifle into a duffel bag, but I got the impression that the Thunderstruck was at least man-portable.
would have to brace just to fire
runs on batteries how many shots before your out of juice
You don't have to brace to fire this thing. There's not enough shots per turn to really warrant much in the way of recoil compensation, either. In fact, the description of the item states that it has lighter recoil than your standard auto-cannon. Thus, anyone that would carry and fire a Panther Autocannon XXL should be perfectly fine to fire the Thunderstruck Gauss Rifle. The description of the weapon also states that it takes a single power clip, or it can draw energy from a satchel pack, power backpack, or vehicle power. So the energy limitation is based on how you have it connected.
uses customize ammo
Not sure where you're getting this idea. It uses autocannon rounds, which are detailed in the core book, page 433, along with all the other ammunition. It's expensive at 400¥ per round, but it's not for your day-to-day operations either.
if you miss or hit soft target what's going to stop the round
how many hoses did you just shoot through
how many innocent did you just kill
how soon after you fire this thing the corps and the military come after you
Well this is a lot of questions that no one really can answer. I think you're confusing this Gauss rifle with something from anime. It doesn't blow through houses and the rounds don't travel forever. They stop when they get done penetrating targets. Granted, it has a LOT of penetration value, but it won't go through houses and innocents, just tearing a hole through a city. As far as the corps and the military go, they've got these things too - hell, Ares designed it for military applications. It will get a lot of attention, but so will Betaware Wired Reflexes - they're the same Availability.
unless you in open desert or in a war in someone else back yard you should not even want this thing
Your average shadowrunner won't be in situations that make use of this type of weapon (or any autocannons for that matter) very often. But on the off chance that a GM wants to use the weapon, either as a temporary armament for the team, an enticement for the team, or against the team... why not put it in the book?
I bet a geco grip smart liked shotgun with dear slugs would kill faster and faster then that thing
I bet you're right. But it also wouldn't do it from as far away, with the same accuracy, or the same punch. If you're up against hardened armored targets, which is what this kind of thing is FOR, you'd much rather have the Gauss rifle, I can guarantee it.
