Case is five, but, y'know, bigger. CPoV podcaster. Find me where the SKIES are BLUE.
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This is pretty obvious to me. Look at the generally underperforming entries from the 2014 Players Handbook: Draconic and Wild Magic? One was underwhelming and one was almost worse than no subclass at all. The next few were the Storm Sorcerer, followed by Divine Soul and Shadow...
...so while I entered 5th edition with a great deal of enthusiasm, I was quickly satisfied that the class was fundamentally sound and moved on to championing classes that received love later on in the decade since the 2014 PHB was published.
So much so that for a time there was an Unearthed Arcana updated version of the whole base class that was used in Adventure League. And that update was broken powerful!
Don't get me wrong: The Barbarian was always far from the weakest class in the game and did quite well at early levels, but that strong start made multiclassing tempting because the later level features iterate on the low level ones, rather than providing something completely new
I want to start here because I have the most experience with this class and the base class is really only getting upgrades in 2024. Meanwhile, the subclasses from the 2014 PHB all get some form of upgrade and the 4th is a subclass we've seen before.
As with many characters in the series, we meet Carlie Donewicz years past his glory days. He had a career in his youth as "The Steel Jacketed Man", a Sandman style villain who was part of a Frightful Four style gang of medium power levels. He was their "strong guy". 
Dale Enright was an aeronautical engineer who got caught in a turbine explosion and came out with vast might and durability, as well as an incredible flight speed. In flashbacks we see him having a slew of Silver Age Superman style adventures. However, we meet him long past that. 
Roustabout was yet another #SupermanAnalogue from the "Local Heroes" collection. The story follows a girl named Cammie who's staying with her cousins in the countryside. She complains that it's not as exciting as Astro City until she finds out there are heroes everywhere! 
Atomicus was a newly born radioactive being taken human form. The text explains not to dwell on the nature of the beings origin, just that he was a new being in the body of an adult. While he was knowledgeable and social, he lacked the experience of an adult to feel comfortable. 
How did a human become a composite of 4 aliens, you ask? Why they shot him. Yep. Ace Arn encountered a group of alien slavers, each armed with guns that would transform their targets into members of their own species but under their command. Does this make sense? Fuck no! 
Voiced by Wakko Warner himself, Jess Harnell, Captain Hero was an archetypal Superman type in a series full of archetypal characters, spoofing early aughts reality tv like #RealWorld, #SurrealLife, or #BigBrother. 
I mentioned them last time when I was talking about the 50s Power Man. By the time we got to the Silver Age, Superman (and his younger version Superboy) had become a very closely associated with having robot helpers to assist in maintaining their secret identity. 
Power Man appeared in a story where Superman was threatened by Kryptonite, but he didn't want to risk Batman and Robin's lives. Instead, he deployed a robot to act as his surrogate, disguised as a new hero. While he couldn't fly, he was plenty strong and able to handle shit. 
What? Even that dreamy Protex? Yup! The Hyperclan actually came to Earth to reclaim a world they saw as theirs, a world they rules when they expanded from Mars. That's right! These are White Martians! As strong and fast as Superman with shape shifting and telepathy. 
The most famous member is of course Lar Gand/Mon-El/Valor/M'Onel, aka Superboy's big brother! This guy is a silver age alien that young Clark Kent found, adopted as kin, then poisoned him like a petty bitch and imprisoned in a hell designed by his father. Wait... 
I covered Supreme a long time ago, but the nutshell is early Image expy of Superman who was vain and violent, with a shifting origin. Then Alan Moore came in and rebooted the character (Ha! Classic Moore!) And did so by having him actually meet all of his past iterations. 
So this is a race that's hard to talk about without spoiling good chunks of the series and I really don't want to do that because this is a book that I think is really worth reading from start to finish. I'm going to avoid big ones, but there is an early one that I have to note. 
Cla$$War was not... subtle. The series began in 2002 with Authority style hyper violence and even angrier politics. It featured the Superman of the Justice League expy group called "The Enola Gay" going AWOL when he realized that his actions were in the name of American hegemony. 
Wait, who? That's the question we were all asking when he first showed up. But with powers like his, Bloodwynd was able to stand out. This guy was even present in the fight against Doomsday and did ok until exposed to his weakness. 