Adrenaline is great for the end of the rounds, but too much, (especially early in the round) can cause you to get sloppy and can wear you out very quick. When I run, adrenaline is never a good thing. It’s great for short-time periods only.
If you don’t get an adrenaline rush when getting in the ring to box there is something wrong with you. The secret is to find out to channel it to good use. As someone said on this thread it can cause shaky legs, rapid heartbeat, etc., My problem is that first real rush tends to tire me out rather quickly. Once I get by that and calm down I’m ok.