You can only make a silk purse out a sow's ear within limits of possible optical correction. The physical beam source/diode has horrible/poor beam quality to begin with and that is not going to change no matter what you do.Is that good or bad ?
Your question is equivalent to asking which flavor of plain or french vanilla ice cream is good or bad. In other words your question is entirely subjective and not simply answerable. There's plenty of information out there on divergence, Rayleigh Length and how to measure it.
You are right --is that good or bad, it is subjective and almost meaningless question with relative to what not specified.You see, no matter how you ask the question it still comes down what you prefer.
Intrinsically a NUBM44 diode laser has a poor quality beam so is never going to be really good good, as in an excellent gaussian laser beam sense.
Here are some interesting and useful calculators from Ophir:
Focal Spot Size Calculator Laser Beams: Focal Spot Size Calculator | Gaussian Laser Beams
Laser Power Density Calculator: Laser Power Density Calculator | Ophir Photonics
Laser Focusability Calculator: Laser Focusability (Gaussian Beam) | Ophir Photonics
Laser Power Through Aperture Calculator: Laser Power Through Aperture Calculator (Gaussian Beam) | Ophir Photonics
Laser Peak Power Calculator: Laser Peak Power Calculator - Ophir