NEARLY died. When surround by opponents on every square at first level you shouldn't NEARLY die, you should die..
Depends, in a grim and gritty game yes. In D&D where you have decent HP (even at first level) and where there's a cleric doing everything he can to make sure you don't go down? maybe not.
If you like grim and gritty - limit the healing magic and there you go.
Regardless though, you're stating the situation completely wrong. there were 6 kobolds (and about 4 rats at the time) and the party had 4 people, I never said the slayer was surrounded on every side by kobolds.
The problem is that this doesn't represent training. The fighter's +2 on weapon damage represents training. This represents that no matter what the fighter is able to get damage in... for some reason. It is the "for some reason" I take objection to. It is the fact that EVERY TIME, no matter what, doesn't matter if they are drunk off their ass or poisoned or anything, as long as they have STR 16 they will KO a kobold WHEN THEY MISS.
It's not "for some reason," it's that HPs are an abstract construct and the Slayer theme plays with that more than some others. It's a minor benefit that can KO a minor (as in really minor) monster or cause annoyance to a larger one.
Not everyone is comfortable with that - and I think the designers of 5e realize this which is why this is in the form of an add on theme. Don't like it? Don't use it!
But as you just pointed out in the post up until here. They AREN'T dangerous in numbers. They aren't dangerous to that fighter because even on a miss he is killing them dead. As pointed out earlier he may as well not bother rolling and could point at the kobold and just tell the DM that it dies - because he does 3 on a miss, no matter what.
After having fought 6 kobolds and a bunch of 1 HP rats, 2 characters nearly died - that's dangerous. It was dangerous enough that when they saw 30 kobolds the group did not even think for a moment that they had any chance at all (and they didn't, it would have been a TPK 99.9% of the time).
BUT THEY AREN'T. The part of the post you quoted shows that the fighter is surrounded by 8 kobolds. That represents one in every square. If the fighter is getting out of that situation by MISSING attack rolls then something IS wrong with the game. Keep in mind they are doing this at first level, not at 15th. They are JUST starting their heroic journey and already they have the same ability superman does when he tosses 8 guys off of him when they dogpile. The kobolds simply aren't threatening in numbers.
As i just stated above, yes, yes they are. But aside from that, short of rats these are the weakest monsters you can get (at least in their "basic" form), there is nothing wrong with them being cannon fodder.
They aren't even as strong as 4e minions because you had to at least hit minions.
Not true, automatic damage works on minions just fine. I believe the 4e 1st level fighter has an identical power btw (reaping strike I believe) - and yes I liked that one too.
Entirely ignore the fact that I hate the concept of minions.
It's quite obvious you like your D&D a bit less abstract, that's fine, and it looks like it will be supported, but it is far from "the one true way."
BUT IT DOES. This is slightly tangenty as it deals more with the slayer's ability than kobolds, but it does work on higher level or more HP creatures too. They still take 3. Every round, no matter what, on a miss. Explain that to me? It isn't skill, grit, determination, luck or anything I understand to be related to HP. It is something completely unique that says that this guy is so kickass that he can hurt EVERYONE regardless of skill as long as they are within his reach, even if he misses. I don't get that.
It's not a unique ability, anyone can take the theme if they want. And wizards can do it too, in the form of magic missle.
It's the same concept as the rogue's take 10 ability - the slayer is so focused on damage that they always do at least some - not enough to kill in one blow (unless the monster is truly weak), but some. If you are completely uncomfortable with this abstract concept you have 2 choices 1) don't allow the slayer theme or anything like it (a perfectly valid choice) or 2) treat it as a necrotic aura, a gift from the god of death, if you will, and problem solved.
First of all you are right. It is going to kill you hit or miss. Second of all, it is going to damage even those people or creatures that don't start with just 2 HP it is going to hurt EVERYONE. Third, the problem arises that the kobolds never have a chance. They only have 2 HP. Unless the DM decides to assign them 4 HP to start they are going to die, regardless if the fighter hits their AC.
Only the mook kobolds have 2 HPs and frankly - they don't have a chance, not one on one, that's the whole point!
Right, and that the fighter is going to bite the ear off the ogre ever round (on a miss) until it is dead..... how many ears does the ogre have?
Ear, other ear, nose, poke in the eye, wear it down - it's an endless descriptive list really.
But the real point is you are focusing way too much on hit vs. miss. This is more an ongoing damage effect (and not even a particularly large one). But again, if you don't like it, don't use it.