I am not an accountant, but as a tax professional I frequently find myself in accounting/accounting tools conversations with clients. These two experiences with Quickbooks/QBO are common themes in those discussions:
1. Unmet expectations. The client purchased QBO expecting they would no longer have to do any bookkeeping/accounting. QBO was going to handle that for them. When they found out it doesn't, they get angry/annoyed. I try to tell them it's like putting a table saw in your garage and then getting angry because a week later there is nothing built. YOU still have to do it - the table saw just makes part of the job easier.
2. Overwhelm. I think accountants like (and frequently recommend) QBO because there is SO MUCH functionality. It can do lots and lots of things that accountants like/need. The rest of us just experience overwhelm from all the choices - many of which we don't understand. It was supposed to save time and make life easier and now there's just more confusion and frustration. AT LEAST I UNDERSTOOD MY SPREADSHEET!
'User-friendliness' depends on the user. What you need and how you prefer to interact. Many software providers offer a free test drive. Perhaps try a few out and see if any resonate with you more than QB/QBO. Or you could try the QB tutorials. There are quite a few.
Best of Luck with Your Real Estate Investing!