Mack Sennett's 3 syllables (1 + 2) hit the Hollywood sweet spot.
Mack's 1 beat vs. Sennett's 2 create a natural cinematic snap.
Mack Sennett's softer consonants cost it screen presence.
Mack Sennett misses the alliteration hook that makes names stick.
Mack (4 letters) and Sennett (7) have a slight length mismatch, but it reads fine on screen.
Mack Sennett has mostly familiar phonemes with a few tricky patterns.
Mack Sennett has decent vowel richness, but stronger A and O sounds would lift it.