Recently I have noticed that Irelia is doing INSANE AMOUNTS OF DAMAGE!
She's always been able to do that.
She's like a honey badger. She doesn't have any bothers to give, ever, and if you piss her off she'll savagely rip you apart.
THAT ISN'T OK!
Why not?
Most champions in LoL are capable of doing insane amounts of damage.
Especially if they're fed.
I've seen three Irelia's carry several games in only two days!
Most fighters, assassins, marksman, and mages are capable of carrying a game if they do well enough.
Mainly they just differ in their reliance on using defense, speed, and/or range to survive long enough to carry their team.
Sucks when you're on the recieving end, but someone on a winning team is usually going to carry. It's usually a member of the marksman archetype more often than not.
Did she get buffed?
got buffed. Now it's less a salad of random stats that always result in some junk-stats on everyone who can use it, and more a salad of stats that all synergize well together to give a massive early-game boost to anyone who grabs it.
Especially ball-of-stat fighters like Irelia, who are pretty much Tri-Force personified, none more so than her.
Irelia's success and failure is heavily tied to the artifact from Hyrule, and you can bet she's strong right now after T-Force got buffed.
She is probably deserving of "better nerf Irelia" being a meme that comes back into play at the moment and perhaps tipping more games in her favor than she should, but she's always had carry potential and insane damage potential in her low points.