Anyone familiar with cons of IOTA ?

I am writing a paper about IOTA, and up to this moment, I could not find many information about "what is not good with iota". Everyone seems to love it although the Foundation are not doing a great job with their light wallet. Anyway, I am looking for some pros&cons of IOTA and till now I found a lot of pros but not many cons.
Please hit me up if you can help. any useful input will be rewarded by some iota donations :)