I've used Family Tree Maker from the very beginning with version 3, it has been updated a lot since then! So have always been happy with using it and it allows me to do what I wish in organising my Family History research. Other people like other programmes, it's down to personal choice really. But because buying Family Tree Maker gives you free monthly usage to Ancestry is worth it even if you end up not liking the programme!
To answer your question, (I think!) it is very easy to add people to the tree, you start with blank boxes to fill your details in and you just click on the empty box for father to fill then mother and just keep going. You can add whatever information you want using the facts list which can then be viewed in your printed trees, or various lists to printout. There is options to add notes in a notepad style window, tasks and research notes to add items to. It is very easy to add photos for individuals. And using information add can print out Pedigree trees, descendant trees in various styles. various lists of facts, relationships etc. Family group sheets which I print out to add to my folders.
If you want to delete someone it is also quite straight forward to just delete the person and all their information, if you want to keep the person but detach from the family they are currently in to move them somewhere else is a little more complicated but can be done.
As Hilary mentioned Family Tree Maker and Ancestry link together (if you have a subscription) so hints will appear in the programme that will attach to resources in Ancestry but you can "switch" them off, I don't use them. Also if you are downloading your tree to Ancestry make sure it is kept private which means that others can't take off information from your tree without asking your permission first.
I hope this makes sense, it is sometimes very difficult explaining something to someone without it being in front of you both! I am happy to answer any other questions
I'm not against any of the others just have always been happy with this one and see the need to swop but the free access to Ancestry is a good reason to buy the product.