I've heard the opposite too, especially if you want to match ACGME. You can't rotate everywhere, but your top programs you should try to.
Before I went through the match, I also believed the EXACT opposite. That audition rotations were the "key" to getting competitive.
But then I took a look at who was matching where. There was no consistent pattern in people matching into competitive fields at places they'd done audition rotations at. It helped some people, it hurt others.
I think people don't realize how rigorous the interview process is, I didn't. After a day at these places when you are interviewing, you have pretty good feel for the place, how the residents feel about the program, and they get a good feel for you. It's usually a fairly intense day.
I worked very hard to set up audition rotations at top programs that I wanted to match into. Ironically, I fell in love with a program that I did NOT rotate through, but had a really great interview experience at.
That's where I wound up matching.
Just do the math. You're going to (or you SHOULD be going to) apply to at least 10, if not 20 programs.
You should have at least 5 that you REALLY like on that list. And 5 more that you would be happy with.
There's just no way you're going to do an audition rotation at 10 places. It's not possible. Program directors don't expect it.
I am NOT saying its a bad idea. I got my best letter of rec from one of my audition rotations. I even got my preceptor from an audition rotation to call the PD of the program that I most wanted to say to the PD "hey, we worked with this guy for a month, he was great, you want him."
The point is, I think its really important to do several (2-3) audition rotations IN the specialty of your choice AT programs you are interested in. But I don't think you should have the expectation that those are the places you'll wind up matching, or even want to be matching.
The residency interview process is MUCHO DIFFERENTE from the med school interview process. You really get the feeling that you are a sought after commodity. You are a US med school grad. They are going to be working side-by-side with you for 4 years (or more). They want good people. And they want people who are going to be happy at that program. They really get to know you in the course of the interview. And vice versa.
The real key, in my opinion, is getting the interview. The key to getting the interview is letting the program know you want to go there. PD's get lots of applications. They don't want to sort through the pile. Everyone has great scores, great LoRs, etc. But a phone call or a personal letter from you saying "Hey, I'm really interested in X program because I heard Y and I think I be a great fit because of Z" really drives home the message that you know about the program, want to be a part of their team, took the time to learn about what they are trying to do at the program, etc.
Call. Ask. Write. Make it personal. Don't be passive and just click boxes off on ERAS. Be specific. Ask them what they are looking for. TALK TO THE RESIDENTS. Don't be shy. Be proactive. Definitely don't be OCD and annoying and insistent, but put yourself out there.
Anyway, this was MY experience (n=1), others may be different. I hope this makes sense, and is helpful.
bth
Last but not least - If the program has never accepted a DO, don't kid yourself that an audition rotation will help you "overcome the anti-DO barrier". I had a PD director flat out say to me "we really like you, you're gonna make a great resident. But we have a policy: we don't take DO students. That's just the way it is." And they never have.
Also, full disclosure. My experience is 100% ACGME programs. I did not, would not, would not ever apply to an AOA accredited residency program. (Unless I wanted optho, derm, ENT, or Rads.) I just would never have done it. I would have rather walked away from medicine altogether. I know that's super-extreme, but that's the way I feel about the AOA.