Not a huge Harlequin fan but I've been working a ton of hours without much time to read lately...so I've been reading some freebies picked up over the years and admit that sometimes they provide the quick read that I need to break from real life. But they are VERY hit or miss (and few stand out), so in addition to reading the suggestions here, I looked around the web and found this link:
http://www.rtbookreviews.com/rt-awar...es-and-winners
You can pick a year and if you scroll down to the Series, it has their winners for the best Harlequin books by series.