I have been through this before. I don't think all big companies are like this, but there is a bias at large enterprises towards moving slowly and more carefully. Honestly, this is one of the main reasons why big companies buy startups in the first place. It is also a key reason for why many of these acquisitions fail.

There are really two considerations.

1) Do you have any financial interest in sticking around? A lot of times when there is an acquisition, the acquirer offers employees a bonus to stick around for some period of time and hit certain goals. Or the salary might be a lot better. It could be in your interest to stick around even though the work situation isn't great.

2) How crazy is this making you? One option is to adjust your expectations and get used to things moving a lot slower. If you really can't put up with this, then there are a lot of other jobs out there. The bright side of this gridlock is that you probably have plenty of time to look for a new job.

In my case, I lasted about 4 months before I left. Within about two years, the product had been shut down and everyone involved with the acquisition had left.