I too am not impressed with Udoka but I think he will get better in time. It is one things to be an assistant and another to be calling the shots.
Some of his rotations are trash. He took forgot to get Rob on Randle the first game. The small ball last night was an absolute disaster.
I also realize he is a new head coach and he is still learning the guys and he will get better.
We are also a small team, and need size.
Guards (G): Smart, Schröder, Pritchard, Langford
Wings (W): Tatum, Brown, Richardson, Nesmith
Swings (S): Horford, G.Williams, Hernangomez
Bigs (B): R.Williams, Kanter, Parker, Fernando
I don't think we're small at all. Perfectly fine at all positions.
The problem is the rotation and the balance in both quality and qualities (if you know what I mean).
The inbalance is easy to see when you distribute minutes in a common system with: 1/2 G, 1/2 W, 1 S, 1 B.
Let's say G(72), W(72), S(48), B(48). Example for a distribution per player:
Guards (G): Smart (28), Schröder (28), Pritchard (16), Langford (DNP)
Wings (W): Tatum (32), Brown (32), Richardson (8 ), Nesmith (DNP)
Swings (S): Horford (28), G.Williams (20), Hernangomez (DNP)
Bigs (B): R.Williams (28), Kanter (20), Parker (DNP), Fernando (DNP)