Lyles skill set at 6'10" is impressive. I'm not sure I've seen anybody at his size in SL who can put it on the floor as effectively as Lyles. His ability to dribble, stop on a dime and pull up makes that pull up jumper unstoppable - now it needs to start falling. He has to be at least top 5 in terms of passing big men in SL. Other than the fact that he isn't hitting shots, offensively for the most part he appears to have a good feel and plays older than he is.
Defensively, he simply plays young. He plays weak, seems to have a low defensive bball IQ, poor timing and even subpar effort at times. I think as he gains experience, gets stronger and understands the importance overall of defensive effort he'll be fine. He's long and moves well, so the physical side is there.