Sounds like Beta2, my least favourite map as it is so difficult to get anyone to fight on it. The main problem being the barrier mountains running across the front lines that force planes up to high alts. Once up there and in enemy territory many players are loathe to drop below 10K since the mountains then block their escape route. The long flight times and lack of CVs don't help either.
The best thing about Beta2 is that being so small its not around for long. If the big maps had a time limit or a reduced percentage of fields needed to win there would be less complaining about them.
I agree its not a map size problem, it is a map design problem. It is possible to design or modify an MA map to better cater for low player numbers whatever size it is.