The phrase "mostly acceptable" is correct and usable in written English.
You can use it when you want to express that something is generally acceptable, but not entirely. For example, you could say: "I think the proposed plan is mostly acceptable, though there are a few points I would like to discuss further."
Even the desserts — mostly acceptable but not exceptional — include huge balls of fried ice cream that could easily serve three.
Thermal comfort in the monitored classrooms was mostly acceptable but temperatures tended to be much higher in practice than the design assumed.
The press could do more to meet the spirit of his report by creating something largely compliant with the judge's (mostly acceptable) recommendations for what a regulator should look like.
CL specialties were chosen for their acceptable hours of practice and mostly acceptable on-call schedule.
From the simulation results, it is seen that this deviation is mostly acceptable for a wide range of network parameters.
For the assessment evaluation based on the Swiss sample, the weighted mean squares and t-values were mostly acceptable.
Previous research resulted in the identification of a core pharmacophore blueprint for H3R antagonists/inverse agonists, which when inserted in a molecule, mostly ensures acceptable affinity.
While many assume such acts were rare outbursts by bloodthirsty vigilantes, lynching was fairly socially acceptable, mostly in the South, though it occurred in all but four states.
Between pairs, the average overall agreement between the tools is also mostly in the acceptable range of 75to90%0% (Hartmann 1977).
Several standards have established some metrics for performance-based assessment of dams which are mostly based on acceptable levels of damage in relation with different design level earthquakes.
Battery exchange and inductive charging, which were both novel to most of the respondents, were mostly rated as acceptable alternatives to refuelling ICEVs.
