Perfect matchmaking is never going to happen , blowouts and one sided matches are a reality of competition

I play PVP. I have over 1000 hours in pvp. Tge matchmaking just sucks, I get paired against 6players of my skill and paired with 5 teammates that are blue berries. In one match, I had 400 kills in Crucible last week, and the rest of my team had less than half. Some had around 80, and that's how you can see how bad the mm is in Destiny.

Yeah that does suck, I have been in a ton of those, I'm definitely not good or anything, at my best, I'm slightly above average but I get absolutely worked all the time. I have also been on the winning side of those lopsided matches quite a bit. It's weird how it works out sometimes. I try to use the below quote from philosopher Marshawn Lynch as my motto while playing Crucible 😂: "I know I'm gon' get got. But I'm gon' get mine more than I get got tho."

On the contrary, I can say with absolute confidence the reason I don't play PvP is because I'm bad at it.

If you don't PvP often, I'd expect you to get lopsided matches like that because it's a part of his SBMM works... When you play your first round of PvP, the system doesn't know where to place you, if player skill is ranked from 1 to 10, it doesn't know if you're a 1 that's just about able to aim a grenade throw or if you're a 10 that can grapple a thrown-strand, ride it half way across the map and obliterate all opponents with a super. For your first round it may pitch you against a team of players around the 6 or 7 mark, and if you get obliterated by them, it'll match you against a 5 or 6 group, and it'll continue until it finds the group that you destroy. At that time it'll bump you back up a bracket to see if the previous round was a fluke. SBMM isn't going to find your perfect match after 1 round, it isn't going to find it after 10... It's going to take hours and hours for it to get a proper idea of where you fit on the skill scale. What Bungie should do is introduce a clear and visible skill display, a 1 to 10, to show you where the game currently has you pegged within the SBMM framework.

Happens every so often and with a low player base going to be more common than not

Those matches like that do suck, but the thing is that everyone gets them. Unfortunately, the game doesn't quite work like the majority of people say it does most of the time. That includes every level of player that will look at something like that and think that what the game was trying to do was create balanced teams. It would be impossible for the game to create all balanced teams for everyone playing at the same time all the time. What happens when people are encouraged to expect the game to be able to do that is generally matches that feature gameplay that causes people to quit and also it will still end up with similar outcomes to the one you had. Its hard to say exactly the way you should look at a match like that without knowing where it fell in your play session, but the fact that you appear to have come in first on your team can actually be kind of a "good" sign for you. Outcomes that look specifically like that don't necessarily have to happen as often as they currently do, but the reality is that it would most likely be worse in terms of the game being able to match peoples' expectations for the kinds of outcomes the game is supposed to produce for them.