Maarek's issue is hes overshadowed in the TIE Adv and in the TIE Defender theres no way to lock in a crit except Calculation or Palp (or forgo the amazing titles and put mangler on him).
Hes great, but because hes almost complete RNG, hes usually passed up. Vessery hits like a bloody truck and Ryad is super evasive.
Ryad is lower pilot skill and Vessery needs setup.
Defender Maarek is possibly strongest when you don't try to set up his ability: I'm fairly sure he doesn't actually pay for it. Since Wave 4ish you only pay points for your pilot ability if it's awesome: if it pays for itself with a setback it's free. Porkins is an example of this.