If any long term players are reading this you'll remember in the late season 1 and early season 2 pre-season the Bruiser class was HUGELY over powered and causing havok with the meta.
Players soon realised that Madred's Bloodrazor was a really viable pick especially against teams that were packing 2 or 3 of the big *******s.
But lets use a real life example, today I played a game against Lee Sin, Darius and Pantheon on a single team, their other teammates were teemo and Alistair. So we had 3 bruisers and 1 tank/support. All of whom saw fit to stack health with Warmogs Armor or frozen mallet. we of course we powerless to stop them. As kassadin i built the New Liandry's tomrent but only having 4 spells and being basically a single target champ, (i know he has a lot of AoE but you focus one guy) I wasn't able to apply any sort of signifcant damage beyond a single target, as it were i could burst any one of these guys for about half their health, seeing as they all had around 3k HP, thats not bad, 1500 dmg is quite good for half build. But herein lies the problem. I was the only person who could build and anti tank item because i was the only pure caster on the team.
TLDR; removing Madred's Bloodrazor has brought the old problem back of bruisers being impossible to remove in team fights, darius can now get 2 warmogs and simply wait in a fight until it's time to ult because he sure as hell won't be dying any time soon.
Good Job Riot!