Yeah, I'm a huge Diana Ross fan, and even then, none of her albums would feature among my favourites. They're all a bit patchy.
That said, Eric is right that 'diana' is probably the best of them, but her debut ('Diana Ross') is almost as strong. 'Surrender', 'The Boss' and 'Take Me Higher' are all pretty good too. After that, 'Every Day Is a New Day' and the underrated 'Last Time I Saw Him' are probably the best of the rest, in my opinion. Let's see if I can come up with another three to round it up to ten - 'Baby It's Me' is a bit too polished, but isn't at all bad, 1983's 'Ross' is a bit marmite-y, but it's my favourite of the '80s RCA albums, and then as long as you have a stomach for schmaltz, 'The Force Behind the Power' is very good for what it is, even though what it is would make many people run a mile.