The CG films will received mixed reception by most due to how they are. To be completely blunt, they're Resident Evil CG films. For better or worse, they feel like Resident Evil cutscenes in the format of a movie. That will either make them worth watching for you, or not. The CG isn't particularly impressive and bit cheap looking, but it also doesn't look that distracting or bad (I guess average would be the word I'd use), and the plotlines feel like a Resident Evil plotline. The films are canon in the universe of RE, and in particular Revelations 2 had direct references to both Degeneration and Damnation in the game.
Degeneration is probably the weaker of the two. It has zombies and
in the film, but many people (including myself) don't like how Leon is portrayed, since he acts like an emotionless robot in the film (thus the jokes about robot Leon featuring in Degeneration). It's surprisingly slow-paced, but has the sort of conspiracy, character moments, and biological weapon testing aspect you'd expect of a Resident Evil storyline. There's also a character voiced by Laura Bailey who I view as being Helena beta version, kind of looks like Helena, sounds like Helena, kind of has a similar personality, conflict with a sibling going B.O.W., works with Leon, etc. Claire is enjoyable in the movie I thought, and a few fun scenes and nods. Something I also never seen mentioned by people, but Degeneration actually has a pretty decent soundtrack to it. Even the music kind of sounds like a Resident Evil game's soundtrack, and there's a couple odd remixes in the game, such as this remix of a theme from RE2 cutscene theme:
https://www.youtube.com/watch?v=AWhjueKPW-I
As most will say though, Damnation is the better movie. The CG quality does see a bit higher production value for one, but what really helps it is that the pacing is much better, and the characters as a whole are much more enjoyable (Leon actually acts like Leon, Ada replaces Claire as the secondary protagonist and is enjoyable in the film, the side characters are much hammier but likable). The story still feels like a Resident Evil story, the action scenes see much improvement. It's basically Degeneration, just a bit prettier looking, Leon acts like Leon as opposed to a cold stone robot, better pacing and action scenes, and replace Zombies and
with Las Plagas, Lickers, and Tyrants.
Since you've played Revelations 2, Degeneration establishes what TerraSave is and that Claire is in it, and get to know a bit more about them in Degeneration. There's a Russian Radio report in Revelations 2 talking about the events happening in Damnation since Claire's scenario in Revelations 2 is supposedly happening around the same time Damnation (and they're both happening relatively close to each other, since they're both around Russia). Damnation also came out before Resident Evil 6 (as Degeneration came out before Resident Evil 5), so there's a small story tie-in to RE5/RE6 towards the end of both films, and in Damnation's case, they spoil a lot of Leon's RE6 campaign in the credits of Damnation since cutscenes (without audio and this one vocal song for Damnation, which you can hear here:
https://www.youtube.com/watch?v=YEgC82w4Zlc ) play from RE6 during the credits, and show scenes of Leon and Ada from Leon's campaign, including things from Leon's final boss stuff.
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I find them enjoyable for what they are, they may be the 'truest' video game movies, in that they certainly FEEL like Resident Evil cutscenes adapted into a movie. And they're the only example I can think of off the top where the movies have a canon place in the game universe, and thanks to Revelations 2, are even referenced and used in the games.
I find myself strangely anticipating the third CG Resident Evil film (even though I wasn't that excited for Damnation at the time when it was announced), though notably the third CG Resident Evil will be quite a bit different than the previous two. It should look prettier since SEGA's animation studio is working on it (who have worked on a few very pretty CG films for some French IP thing), and the people behind the third CG RE film are promising. Though the Japanese press release says that the third CG film will be trying to make itself more like a 'horror' zombie film, and we know Leon, Chris, and Rebecca will star in it. It also seems they may want to, starting with the third CG Resident Evil film, attempt to make a bigger franchise out of the CG films, they claim apparently the film is being made with the idea to kickstart some on-going film thing that may run alongside the games if it's successful (the other two CG films did pretty alright).
Is she the person who voiced Claire in RE2?
And if so, has she learned how to act since then?
"There's a gun inside."
Yup, and she does better in Degeneration, no worries. She also voiced Claire in Darkside Chronicles/Code Veronica. Leon is Degeneration is also voiced by his RE4's/Darkside Chronicles VA. In Damnation, Leon is voiced by his RE6 actor (as is Ada).