Nope, you aren't missing anything, it is slow, very slow. What is the alternative? Wholesaling or flipping? Those are both reasonable ways to make money faster, but there's a downside to that too. When you buy a fixer, repair and sell it, cash your check- then what? You have to do it again. As a wholesaler, same thing. you aren't building equity. Not to offend any flippers or wholesalers, but I personally don't see that as investing because you aren't building any long term equity or wealth, you are actively working for a paycheck. Flippers are wholesalers are self employed and it is a job. A very difficult and risky job. The IRS taxes that income as regular income as well.
In buy and hold, the monthly returns are usually much smaller, but it's generally passive and you can depreciate the house for 27.5 years. The greatest benefit is that you have equity that slowly builds in the house and will pay you dividends forever, maybe your kids and grandkids too.
There are many flippers and wholesalers out there who do really well, but if you ask, most of them will tell you that the reason that do all of that hard work is so they can buy and hold- that is where wealth is built. Good luck out there!