I personally found the first few Hanon exercises to be very helpful when I was very first starting out. Many people have scoffed at that but I don't really care because it worked wonders for me and the proof is in the pudding as they say.
I started them out very slowly, of course, with absolutely no rush to get up to speed. My main concentration was on playing with an even cadence and precise synchronization between the hands. The thing that I liked about it was that it was something that was so simple to play that I could easily play it right off the bat (albeit slowly), and it got all of my finger involved instantly. Moreover I could easily tell if things were synchronized or not. I found it extremely helpful to get my fingers accustomed to dancing smoothly on the keyboard.
It seems absurd to me to suggest that Hanon could be harmful at that stage used in the way I used it. I think where it might be harmful is when someone plays it constantly and pushes for ultimate speed. I wasn't the lest bit concerned with reaching speed. I was much more concerned with learning synchronization and smoothness. And for that it helped tremendously. I did eventually get up to speed smoothly, but that wasn't the point of the exercise in my mind.
I also used those same Hanon exercises later when I bought a metronome which seemed quite alien to me. It was easy to play Hanon with the metronome and gave me a feel for playing with a metronome before I went on to try it with other studies.
I am a very passionate supporter of Hanon exercise if used properly. I think they get a really bad rap because most people use them improperly. In fact, most teachers don't even introduce Hanon until much later. Personally I think that is a total waste. Their real value if for the raw beginning IMHO. Just don't become obsessed with them. Use them to limber up your fingers and get a feel for cadence and synchronization and then move on to other lessons.
I would also strongly recommend the 12 Köhler studies as a good place to start. They are easy to learn and play each hand separately in the beginning studies and help to meld the hands together in progressive steps. It's a real shame that there are only 12 of them.
You can listen to midi files of them here to get a taste of what they are like:
Köhler Studies