Based on this post existing I assume you are new to blockwars.
And for the sake of your sanity I recommend you avoid it for as long as you've not grown attached to it.
I am not joking btw.
Bugs are very common and tend to take very long to fix while most of them are also known by the devs and/or staff. Not to mention that even if they get fixed, they often come back at some point later, usually just after the next update (tends to happen a lot after both: server updates AND minecraft updates)
People not talking it pretty much the norm. And when people talk, its usually in foreign languages only 4 people in the lobby know or only to people that they are somewhat familiar with.
And most random teammates you will have will be useless. Not even just because that's the normal "random teammate" experience in online gaming, but simply because blockwars tends to attract a lot of such people.
Teammates normally don't act like "bots" though.
There is also a good amount of trolls, especially in giga blockwars, and the moderation is not very good at dealing with them.
For example: there is a guy who I made several posts and forum reports on. And after a year he is not banned, though he was close, but someone on the appeals team decided he is worthy of being unbanned despite his list of offenses including notorious and repeated trolling, teamkilling, and staff witnessed use of cheats.
I am also not sure what you mean by "mine the flag block". You mean that you tried mining the blocks the flag is standing on?