I've used LEDs ever since I got back into the hobby. My thought is that it takes some time to get them dialed in but once you do they are great. The T5 LED combo is very popular but mostly for spread and coverage not for PAR.
I think a lot of the negative stuff I've seen is from blasting stuff with too much light or buying something with LEDs that aren't strong enough. So just make sure you can dial them down and know what you're getting.