they aren't rubbish,
When I taught Bushcraft & Survival professionally a few years ago I used two knives for everything!
a Gerber multi-tool, for fiddly stuff and an MOD survival knife for everything else.
everyone who tried it wanted one. no doubt someone will say "don't get one", but I used mine day in day out for years, I've never had a problem with it, i say they're pretty darn good!
lots of people poo-poo the idea, but most people don't know that even
Ray mears use one when he published his first book "the survival handbook"!
I used it mostly for chopping through saplings up to 6" diameter, but it will also plane wood and you can easily make things like tent pegs etc.
also a hammer, log splitter, I've used all sorts of axe's but i prefer the MOD Knife as it is so much more versatile.
But because of the constant negative views i made a toy car for my son, just with the MOD knife just to prove you can carve with one!
(plus you'll never break it!
You can buy them you just have to get them over the counter at surplus shops.
Hoopers in Norwich sell them.
rich