the biggest thing beyond the obvious quantitative stuff...
i guess i learn when things disappear... pay attention to depth of draft between years... pay attention to when various quality of positions disappear...
certain trends repeat -- for example, after the obvious SP are taken and mostly low potential and 2-pitch pitchers in the guise of 3-pitch repertoires etc, i find the best ones are typically the Position players that show any modicum of pitching skill... as in their control/movement and stuff are viable for the MLB at a much later draft round than it should be. 50/50 on one of these guys vs a 2-pitch SP is worth the risk.
so, don't filter by "SP only" -- "All pitchers" on the other hand is Okay. that includes the 3b or ss that also has experience as a pitcher.
how i draft is a bit odd.. it's part of a much larger system. i stagger ages, control contract lengths in very spicific ways so as to never be painted into a corner. If i replace more than 2 batters in my lineup, it's an odd year. ~4 players a year on both sides is typical max change. when i don't stick to this for various irrational reasons, it tends to hurt my team... but i do so when it's an acceptable loss.
e.g. i recently held on to a knuckleballer until their ratings took a dive.. i very rarely do such a stupid thing, but i was looking to maximize a carreer player with my team. i am irrational when it entertains me enough
this effects drafting strategy. i never draft high, so i focus on trade assets. what i draft is rarely for my team. if various rules or settings makes 120-130-140win average impossible, this may or may not be a good strategy - at least not 100% of the time.
after the first 10-20 picks i rely much less on potential rating as a sorting device... i use filters for various roles on a team. that will be the same regardless of strategy.
if there are too many options to hold in my head for 1 particular round, i shortlist and weed out from there.
no matter what... as you gain experience chang and adapt... stick with it until you know for sure it's worse or better .. rinse and repeat... i am still changing how i do things all the time. i like to think it's always for the better, but somtimes we all take a step back... it's worht it in the long run. you can squeeze what no one else can squeeze out of the game