I'm going to start collecting all the ROH PPV and IPPV events. They didn't have some of the earlier ones, but i went back as far as I could go.
Repsect is Earned 2007
Take No Prisoners 2008
Respect is Earned 2008
Glory by Honor 7
I'll give my two cents on all of them.
Respect is Earned 07 - Good introductory PPV
Driven 07 - Must see Danielson vs. Nigel. Out of Print, but worth tracking down.
Man Up - One of the best ROH's shows of all time. Unforgettable Ladder War.
Undeniable - Big event, not the best PPV this year.
Rising Above 07 - Nigel vs Aries, in a must see, almost 5 star match.
Take No prisoners 08 - Again must see main event.
Respect is Earned II - Solid show
New Horizons - I was here live, i thought it was an OK show. Not the best PPV.
Driven II - Rare show. Some matches.
Rising Above 2008 - Best PPV of 2008. Climax of two major fueds in 2008.
Final Battle 2009 - First Ippv - Very good with memorable moments and good matches.
Big Bang - Solid PPV. Fun match event, weak lower card.
Death Before Dishonor 2010- One of the greatest ROH Shows. Must see
Glory By Honor 9 - Epic event, decent wrestling. Awesome show live.
Final Battle 2010 - Another must see show. Two awesome final matches.
So basically there is 3 era's of PPV's 2007, 2008 and the IPPV series. 2007 had excellent build up to the next show, and some epic main events. In 2008 they didn't put as much emphasis on the PPV's and they were putting them in B markets like Detroit, and i think Boston got one as well. Some great matchups, but the only one that really stood out to me with Rising Above. Great booking that year as well with the AOTF/Aries fued, and Danielson chasing the reigning champ Nigel. Good stuff. The IPPV series has been very solid. You easily get your moneys worth, and these are what Live PPV's should be. Shocking events, good/great matches, solid build up. ROH hit on all cylinders with these shows, so picking the PPV's to watch is a great starting point. Not a bad show with any of these. Certainly there are great DVD's too, but starting with the PPV's works imo. Maybe not the most in depth review of each ppv, but i think with this narrative below you get the idea.