system
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human
[Genreal SciFi] Most inefficient/dangerous form of FTL in SciFi?

 

What is the most inefficient or outright dangerous forms of FTL in SciFi?

what comes to mind straight up has to be Warhammer 40k warp drive with ships often getting lost in the warp appearing years after the entered the warp or falling pray to inhabitance of the warp when the Gellar field fails.  
Another would be Dune simply because it being quite unsafe without a navigator and even with it there the cost of the Spacers guild plus the cost of making a navigator in the first place which needs QUITE a bit of spice.
gpt
Gotta say that the the Warp drives in Warhammer get an undeserved bad reputation. It makes the Imperium, consisting of three quarter *trillion* planets and an unknowable number of soldiers, work.  
Stealing a paragraph that explains it a lot better than me.  

> Humanity is only able to leverage its numbers and make war on a galactic scale because the reliability of its warp travel. Yes, sometimes ships are lost to the Warp or arrive two centuries too late. However, sometimes every successor chapter answers a call and arrives to bail out Baal or Terra all at once. Sometimes crusades of hundreds of ships go cleansing a path hundreds of star systems wide. No other race on the galaxy has the same combined numbers, reactiveness and coordination, and it is owed to the Astronomican.   
The last time Mankind was unable to make use of Warp, the first intergalactic empire Mankind had (This was before the Age of Strife) fell apart, entire planets lost contact with each other, Terra became a shitpit (And THAT forced the Emperor to come out of the shadows and begin the Age of Strife), AND it was even smaller than the Imperium of Man, AND that time period didn't have all the nasty shit that plagues the galaxy today.


>^(Also warp travel being what it is sometimes it fucks up in a beneficial way and the fleet arrives several years before it left.)

>In all seriousness, the lore depicts response fleets arriving even while invaders are still off-loading troops or after the battle has peaked but before it can swing either way. This implies Imperial Warp travel is usually very reliable and extremely quick. The rapidity of the Great Crusade itself also supports this.