I personally found the AI quite good, even if it isn't perfect. In fact I only won 1 of my 5 runs to be honest XD. He did use an injection at the end of a round for no apparent reason (he had enough inventory slots for new objects). But apart from that, unless I was unlucky, he properly used every object for a reason. He once ate the last blue in my runs, but in that case it was his last life and he had 1 tolerance left, so there was no good option anyways.
And although I ate the bad pill 4/5 times on the first round, I didn´t see that round innecessary. Because it maight work as a pill tutorial so you don't learn about pills and objects the same round.
You have good points, though. I just comment to give a little bit more of feedback.