I think Irons give you what you believe they do, in other words you can get what you put in but certain irons feel right. I am off 18 and in theory should not touch forged players irons. But when I was offered Mizuno MP 62s I was so taken with them I shot my current best 81. half my handicap. When the swing went bad I blamed the irons and bought some big SGIs. They worked for a few weeks cos I believed they would. As soon as I struggled I found them big and ugly and yes you guessed it, switched back to MP62s, the clubs I had shot my best round with. So actually the SGIs didnt do anything for me,
With the MP62s gettin old I started lookin at alternatives and fell in love with the Cleveland 588 CB, bought a demo 7 and loved it. Got the set and played okay but striking low, so took a lesson and started hitting them so well. It doesnt matter what iron you choose they all work and you should choose what you like holding and work on your swing. 588CBs dont lose distance when you swing well.
Take it to extremes and you can argue that pure blades will hurt poor swingers and I agree with that. But most clubs work, and if they dont, improve your swing and enjoy a quality club. Something that is sold to get you launching super high or always hitting the middle blah blah may seem great for a couple of weeks but ultimately swing faults will creep in and your back to square one.
I bought Cleveland 588CBs and took a lesson to work on my faults, as there are none with the clubs. When I get it right the shot proves what I can do and its a joy to behold. When it goes wrong, I need to sort me out ! Dont try to buy something that allows you to play bad, it doesnt exist. Buy good clubs, invest in your swing, enjoy the results.