I can hit my 4i pretty well and consistent. Fun to hit.
I don't have a 3i or a 2i, so I don't know about those one way of the other.
that said - the 4i is not in my bag. I like my 4h even better.
but, I like to try 'stuff' and might spend a few rounds with the 4i and 5w back in the bag and the 4h and 2h out - just for fun. I like hitting that 4i and 5w quite a bit.
I should go back and try again the 4 iron tho, my iron game has improved a lot lately, but my hybrid have not improved much compared to my irons (4h still goes farther than 5 iron, but my 5 iron is a lot more straighter than my 4h). I'll have to go to the driving range soon!
Whenever my 5i gets a little off to hit, I'll take the 4i to the range and practice with it until it gets good. That always seems to clean up my contact with the shorter irons, almost immediately. Big believer now in figuring out what is the longest iron I can hit, and then using everything shorter than that one. I'm considering getting a 3i just to push my abilities up. Make that 4i a 'go to' club rather than the one that's maybe on the edge of my capacity.