write up on Malachi Fields.
Fields to me is the kind of player who will let you see what you want to see to a good degree. He's 6'4 220lbs and has slightly sub 4.5 speed and plays like it. He has pretty fast feet and quickness for his size and uses his length well. He has plenty of highlight tape of sensational catches. IMO he isn't so much a contested catch guy as a guy who knows how to use his body to maximize his impressive wing span. While I wouldn't say he plays with a lot of power, you do see he fairly regularly uses his bigger frame to bully guys and push forward/fall down for more yards, but he doesn't do it with the violence I'd hope he would. He also has a pretty decent number of moves to get off the line to help him get instant separation. He plays the X 95%+ of the time (which he should) but you can see he has the ability to work the slot if called upon. Also i didn't see much in the way of drops, though i didn't see a drop rate stat so that could just be the sample size i saw.
As for his run blocking, you got to see plenty of it with ND's running game as they are a run first team, for good reason. I wouldn't call him elite per say, but he is good and willing in this area
So what's the problem exactly? Well a few things. His separation while decent isn't as good as I'd hoped it be. He doesn't win consistently and in a number of games he didn't do much. Part of this is ND not being a passing offense, but part of it is him just not winning enough. Yes, with his big body and length there were chances to get some balls to him in any one of those games, but you don't want to always have to use a guys length and abuse the sideline, getting open can be nice too. He also doesn't always seem as well coordinated and fluid as i'd like. Maybe he needs to grow into his size but a number of times i saw him off balance after making a deep catch when he shouldn't have been so off balance, and i always clock a lack of smoothness at the catch point. Everything is harder in the NFL and you want fluid athletes to make things easier for themselves, cause the defenders will make them more difficult
Overall you can look at him and say this is a slightly raw kid with he ability to be a solid #2 in the NFL and one of you core guys (I don't think anyone will think he is a #1 in the making). You could also look at him and think he is a depth/match up piece ALA the 'Hollins' role once some kinks are worked out. When i watch him personally i don't see the makings of an every down player. I see him as one of your rotational pieces. Important, but not core. But someone is probably going to see him differently and draft him higher. For my money, he is a bottom of the 4th kind of a guy at best, but personally I'd rather take him in the 5th. So I will grade him as a premier 5th round player as i don't believe in the upside enough to use a 4th on him. But someone will take him in the 3rd i'm sure, so it will be a mute point.