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Tyler Nubin is an athlete with decent size, although he lacks speed, which becomes quite evident when matched up against speedy or athletically gifted wide receivers. His footwork is rather average, but he does showcase some intriguing explosiveness. 
His back pedal technique is also average, as it tends to be too high, affecting his transitions and often causing him to be late when chasing receivers. Additionally, his lack of recovery speed can put him in difficulty in catching up with his assignment, which may lead to him being grabby, especially when playing man coverage.
Nubin's physical strength is a notable attribute for his frame. It's quite uncommon to see such muscular and physically imposing athletes with a lanky build like his.

His athletic and technical shortcomings are less apparent when he faces the play. Everything seems more natural for him, and he becomes more fluid in his movements.
Nubin has primarily been lined up as a single high or in a two-high safety, allowing him to often face the play and let his qualities shine. 
In this position, he demonstrates good ball skills, much more so when facing the play than when backpedaling. He has a quite interesting catch radius and very solid body control.

In man coverage, he lacks the athletic and technical abilities to excel. He doesn't have the footwork to delay and mirror the releases of receivers or tight ends, nor does he have a neutral backpedal or a smooth and explosive off-man side-saddle technique to handle the opposing player.
He often loses the battle for vertical routes and gets stacked by receivers.

One of Nubin's major strengths is his football intelligence and his ability to read the quarterback and recognize opponent routes. He can cut across routes to defend or intercept the ball with good closing speed. I've observed good hands, solid ball tracking, and a consistent ability to dislodge balls upon contact.

He hasn't been frequently aligned in the box, but I can imagine him providing real support in run defense. Tyler Nubin is a good tackler and powerful, very solid on contact and once again very intelligent. He takes good tackling angles, knows how to shed blocks, and consistently closes his lane to redirect the running back.
His aggressive style of play, leadership, and competitiveness are significant assets for this aspect of the game.
I don't see a potential contribution on the blitz due to his lack of speed, flexibility, and footwork for effective change of directions.

Tyler Nubin is therefore a very interesting and dangerous safety when facing the play. He has the potential to be a true playmaker in this aspect of the game.
His aggressiveness and leadership are very positive attributes for his transition to the NFL.
However, I don't see much room for improvement for him, especially in coverage, due to his lack of athleticism and technique, and considering he will be 23 years old in his rookie year.
As I often say, we buy what we see, not what we hope to get with a player of this caliber.
I estimate his value as a Day 2 talent in the draft. I can understand a selection in the second round if he's the perfect fit for the defensive coordinator's scheme. However, if he's being considered for a more traditional and less tailored role to his style of play, a third-round selection might be more appropriate.