I see the similarities that are being pointed out in many of these pairings, and have noticed them myself:
Dr. No & LALD: introducing a new Bond, set in the Caribbean;
FRWL & FYEO: chasing after a similar MacGuffin;
GF & AVTAK: Destroying one source of wealth in order to increase the value of one's foreign holdings;
TB and NSNA: the same story, 18 years apart;
YOLT, TSWLM & TND: pitting the superpowers against each other over the disappearance of their respective hardware;
OHMSS & FYEO: Ski action and a charismatic criminal partner;
DAF & DAD: using diamonds (in different ways) to construct a space laser (+ MR for 'OTT' elements) ;
LALD & TMWTGG: same director & alleged 'made for TV' low budget look;
LTK & QoS: revenge in Central/South America;
TWINE & SF: personal revenge against M and MI6.
However...
I watched Thunderball and NSNA back-to-back once, but I'd never do it again with those or any other qualifying 'pairings'.
Why watch two films with so many similarities, when it's probably going to highlight these similarities and leave you regarding one of them as 'inferior'?
And it doesn't matter whether you perceive the second one as better or worse. I prefer to base my double-features on how they work for me chronologically or emotionally.
Thank God CR 54 survived, so we can see the two seminal (fnar) Bond stories back-to-back, especially since it means I can watch FRWL with GF and TB with YOLT, without trying to fit CR 67 in anywhere. OHMSS may not work with DAF for most others, but it does for me as they were both December releases. LALD & TMWTGG I can watch together, for all the reasons mentioned above, or I can watch GG with DAF as it is also a December release.
TSWLM works with MR as they are both Lewis Gilbert/Christopher Wood collaborations, while FYEO & OP are both Glen and (primarily) Maibaum efforts. Alternately I could watch OP with NSNA, as they were the contestants in 1983's 'battle of the Bonds' (either way OP wins), or I could watch NSNA with AVTAK, in which case NSNA wins.
TLD and LTK go together for reasons already stated, while Pierce Brosnan only got two double-features, which also work perfectly well in chronological order.
Agreed, CR and QoS make one (unnecessary) story arc, and I can't wait to see what sort of pairing SF will make with B24 (no hopeful title suggestion to be inserted here). They will already have the advantage of having the same director, and therefore probably a lot of the same production crew.
It's early 2014. Bond will be back in late 2015. Roll on!
(ps: Professor Pi: thank you for remembering Blofeld's plastic surgery and not 'cloning'.)