The biggest problem as I see it is spamming from afar with mechs or artillery.
It's possible to run into red base fairly easy without being hit by the Ob but not into blue.
The Ob is almost always the first building to go down in every match on this map which is kind of foreseeable and repetitive. I think every map should have at least 2 possible sneak in routes to base.
You can snipe red Ob from upper tunnel with artillery. This tunnel is seldom used for anything else and could be scrapped or maybe connected to lower tunnels.
Red Ob is damageable by wolverine while the Ob doesn't hit it if the wolv is standing covered at the right spot mid field.
Blue base needs stairs to tiberium where as red does not. Red tiberium field is also mostly covered by Ob while blue's is not.
I'm no big fan of mine fields either but that's more of a subjective opinion.
With all that said I think this is actually a well balanced map which seldom gets voted away. Don't destroy it.

I think it mostly needs spicing up visually and some small refreshing changes to game play.