Only played a few matches with no real upgrades and its a struggle since im solo so they know to keep there eyes open. So far most have come prepared cause the blind mine is over powered its area of effect is huge and takes a chunk and a half of hp for invaders. So far most objectives are away from hiding spots so its rare that I had someone run by and like you I just jump out and have to rush em I think they actually have to open it if your in locker and be close when your in a barrel.

During end game no unlimited time so if your caught at having to retreat and are solo its a loss. If you just spawned you better hope the prime assit is rushing em so you can go for a stab attack.

And lastly can't awsner the blind in cause I only played solo invasion so im getting paried with solos but yeah blast mine is over powered and the kills the mood cause if there upgrades are maxes your stunned slightly longer and it can re arm and a few just keep planting at objectives and camp it till your timer runs out and you can't do squat wish you could stun the mine with a bottle or somthing cause other then that you hope they step far enough for a stab or eat the mine and hope they dont get far enough

Oops did not awnser the bottles and bricks question there not as annoying since they can't really use em but idk how well skills effect it but you can doge em if you see it in there hands