No one ever said it was inherently bad, it just has issues that can always be ironed out.
Read the feedback, ask others what they have to say about it, but I can't force you to continue working on it.
There's no such thing as a perfect map, nothing will ever be perfect. In your case I think you consistently try outrageous ideas that never seem to come out so well.
Find a project you're happy to work on yourself, stick to that. Working on multiple maps at a single time can be frustrating and cause issues, especially when you're still learning to map.
I guess what I'm trying to say is: just because your initial alphas don't play well doesn't mean the map is unrecoverable. Seldom is it that an early alpha will play well. Your maps have potential but you never seem to stick to one lone project and get caught up trying to make a bunch of different maps trying a bunch of different things.
tl;dr find a map you're comfortable with and focus solely on that
Now for some direct feedback on this map:
I haven't much to say about the bases themselves since no one seems to ever get that far for it to matter.
The whole mid (between bases) has a lot of difficult sightlines, little height variation, very few routes and it just feels like one big snaking corridor. It heavily reminds me of a similarly laid out map from Halo,
Danger Canyon.
EDIT: I mentioned this via the feedback plugin but it feels like a huge pushy stalemate where the stronger team will slowly push the enemy team into turtling inside their base (or at least back enough until the timer runs out) and no team will ever score any points.