Neither high, nor low: I got the taste for soloing, so yesterday I thought why not, let's start a Platinum solo. Firebase Giant/Reapers seemed like the obvious choice from Gold experience. It was a fun run, so I equipped no consumables. Kit was good ol' Geth Infiltrator with a Black Widow III (I got another from a reserves pack). Weapon mods were piercing IV and spare ammo V.
It wasn't disastrous, I died only three times until wave 7 (pizzas in both objective waves), where the phantoms took the remaining three medigels in that wave. Two of the three pre-wave 7 deaths were avoidable (overconfidence and mistimed dodge), with a cyclonic III I might have survived all three encounters. What I immediately noticed in the earlier waves is how aggressive are the Geth Hunters. They break cloak earlier, shoot earlier and more often, dodge immediately after the first hit and they come in packs. Geth Primes and their Drone buddies are even more bullshitty than their Gold counterparts, but I expected that, so no surprise there.
Wave 7 begins, and the woes started: I got Cerberushed. The phantoms drained my health IMMEDIATELY, so it was rare that I could shoot more bullets than one on them at once. I took a peak, boom, shield gone or shield+99% of my health gone, once both of them came and I died on the spot in a fraction of a second. I never thought I will ever say this, but they make me wish I was fighting with Banshees. (This makes me curious about the Collector bosses, especially the Praetorian on Platinum, on Gold they are the bane of my existence, even more than Primes, as they are able to oneshot me with their laser.)
High: Reactor, Gold, I destroyed the head of a Prime the first time ever, and then I managed to do twice more in that game. I'm learning to give perfect headshots to Primes, and if I will see this every time I kill them with headshots, I will practice because it is a priceless moment.
Low: I also had some embarrasingly bad games, couldn't headshot, couldn't kill quicker enemies from 3 bullets, died a lot, I went back to silver and played with a different kit for a while.
Edit:
Today's deal:
I joined two people who wanted to duo and kicked me out. That is fine, but why don't you have a private lobby?
Second game was silver, when I searched for Gold.
Third game had no sound whatsoever. Nothing wrong with headset or the TV, because the options menu had its sound when I tested. Made Wave 10 with the ton of phantoms really interesting.
Fourth game: I was able to play it to the end, but the PS froze after the mission successful screen. Today everything is working as intended, truly 
Fifth game: it went okay!
Sixth game: lost connection to server, mmm, perfect. Diary of a Mass Effect player.