This thread again.
The nerf made Irelia very weak for solo top. She couldn't push further than her tower, couldn't trade well with nearly anyone, and had no sustain. Nearly any solo top could beat her if they weren't bad. Irelia DOES have a strong late game, but if she can't *get* to late game, what's the point?
First of all, the buffs were very minor. However, all that she needed was that small adjustment to get her through to mid-late game. She needed the small bit of extra HP (probably enough to survive just a couple more hits MAX), a little faster health regen, and a little more damage. That's all it was.
I don't see why people are complaining about this... It's not unusual for Riot to make small changes to a champion after they nerf or buff them. You can't expect them to get it 100% perfect. They're just trying to find the right "balance".