The best effects I've seen from agile practices have been getting everyone to frequently think about deadline/feature trade-offs, reducing the occurrence of surprise bad news. I'm sure this is possible without "agile", but it's a thing I've seen it aid with.
The worst is probably standups-gone-wrong. There's little more demoralizing than a 20-person 3-team standup where you couldn't possibly care about what anyone says (because it's irrelevant to you) except three or four people, and you already know what they're going to say because you all, you know, talk, and then also having to turn yesterday's work into some epic (LOL) tale of adventure and adversity because your manager's in the meeting and that's the kind of dumb-shit tone they've set for it ("now—justify why I should continue paying you" with pointed, bordering-on-hostile follow-up questions to anyone without a sufficiently-convincing theatrical performance) and you'd like to keep your job. Starting every day with a half-hour of that shit. JFC.
But, I'm pretty sure, overall, agile is one of those things where most places that it works, any halfway-reasonable system would have worked just as well, and places where it doesn't, no system was going to work.
The worst is probably standups-gone-wrong. There's little more demoralizing than a 20-person 3-team standup where you couldn't possibly care about what anyone says (because it's irrelevant to you) except three or four people, and you already know what they're going to say because you all, you know, talk, and then also having to turn yesterday's work into some epic (LOL) tale of adventure and adversity because your manager's in the meeting and that's the kind of dumb-shit tone they've set for it ("now—justify why I should continue paying you" with pointed, bordering-on-hostile follow-up questions to anyone without a sufficiently-convincing theatrical performance) and you'd like to keep your job. Starting every day with a half-hour of that shit. JFC.
But, I'm pretty sure, overall, agile is one of those things where most places that it works, any halfway-reasonable system would have worked just as well, and places where it doesn't, no system was going to work.