Well.... Ada is a bull**** artist and they DID look it up in the movie and caught her through such means. So your point was actually covered in the film
She played them and played her cards very well.
I see what you mean regarding MGS and RE. But Kojima actually writes the games as he goes along, utilizing new technologies and ideas each time. The difference is that RE always gets new writers for the games, Kojima writes his own games and actually knows what the hell is going on and is consistent. He can plan things for future games and prepare for the possibilities. He can reflect on his own work and has even admitted when he ****ed up. I love the guy! xD I feel so bad for him. Phantom Pain was definitely the best game in 2015. Such an amazing game, even if stuff was cut. The main point twist he planned from the beginning was implemented well. The 4th wall was broken in ways never before seen. Most people were ****ed because we wanted to see and play the [fall of big boss and his rise to villainy. Saladin."[/SPOILER] I think MGS is quite comprehendible. I feel the series is tied up very nicely in the end. There are still complex and confusing situations, but you can make sense of them once you get a few other concepts and connect the dots.
The Resident Evil games certainly do have ret-cons. They have been getting better with them lately and actually looking back on the series and Revelations 2 even answered some old questions and tied some things together. For me the biggest ret-con in the series is Albert Wesker's personality in RE5.... seriously what the ****? He was always about amplifying his own body to become the "ultimate power". The perfect being. Taking over pharmaceutical companies to lead one. The whole Uroboro's and taking over the world came out of no where as did the whole god complex. **** was so backwards. I mean at least he had is abilities and D.C. Douglas did an amazing job. He still felt like Albert to me, he just... gained some weird character traits that seemed unnecessary. I believe I sent you that link which outlines the original RE5 concepts. Now THAT is the Albert Wesker that we all know