Oh, wow. I had not realized just how OP we were talking. I've played through most of the game with two characters: first, a decker (hacker); then what I would consider a proper street samurai (brawler).
I didn't do much with crafting hacks with the hacker before finishing the game. He relied almost as much on his guns as he did on his cyberdeck. After seeing this thread, I went back and actually maxed intelligence, finished perk spending, and went through crafting legendary hacks and did some more sidemissions....It's insane. Legendary ping, contagion, and cyberware malfunction, and I clear an area. If there happen to be any left standing, I do another round of contagion. Good lord.
That said, once you get a brawler to full street cred and level 40ish, there's not much that can touch them either. It's a bit more hands on (I went Gorilla Arms with animal knuckles), but I can run in with Beserk going and start plowing through. Cold blood starts stacking, and I might as well be a Panzer.
I do kind of appreciate it, though. I used to play a lot of Shadowrun with my buddies in high school, and this is the same point some of our characters eventually got to--legends who were nearly impossible to bring down. Oddly, I haven't played through as either of my favourite paper and pen characters yet, though; one was a mage, so that's out, as the fantasy element isn't really there in Cyberpunk; the other was a physical adept, which is pretty analagous to what you would get focusing on reflexes and getting a Sandivistan OS in Cyberpunk. Not sure I'm ready for the third character, though. I'm kinda running out of steam a bit, and may be close to the "I'll dust this off when the DLC comes out" point.
That said, I'm just shy of 110 hours, and have enjoyed the hell out of it, so I'm not complaining. My general rule of thumb is I want a game to give me an hour of enjoyment for every dollar spent, so even buying it when it first came out, I'm well ahead of my target. My biggest complaints about the game are about occasionally blowing up for no real reason (probably explosive canisters I didn't see for most of those), and a lot of things around vehicles (spawning under other cars, poor driving--though some of that's probably on me--and regularly being hit by them...again, some of that's on me).