My overall score: 8/10
This review will contain spoilers!
Resident Evil: Degeneration was a really good movie! It's action-packed, true to the canon of Resident Evil, and overall a great movie. A clear storyline with wonderful acting, anyone who likes Resident Evil will enjoy this movie, even more so for Resident Evil 2 fans, as this movie stars Leon and Claire.
Should this movie be rated R? I don't think so. The language used in the movie is rather mild compared to an actual Resident Evil game, and the blood isn't anything too graphic. I'd say that a mature teenager would be able to handle it perfectly fine (I'm 15 as of this review!), and I had no problem watching this.
If you're someone who is motion sickness prone while playing the RE video games, I'd be a little careful with this movie. While I didn't feel bad while watching it, I developed a headache at the end/post-movie.
I did have one peeve with this movie, and it's more of personal preference than a real peeve— Angela and Leon's relationship. While it was sweet that she felt the same way, Angela isn't seen in the series again and it felt like their 'romance' (one kiss scene [which was supposedly necessary to save her life, however it felt unnecessary], a few 'staring into each others eyes' and a flirty remark at the end) was a waste of time. Angela was a great character, and I would have liked to see a bit more of her character development on her own instead of pushing her into a romance with Leon, considering I don't think they had much chemistry at all. I feel like the movie might have been better if it was geared towards focusing on Claire and Leon' relationship— not necessarily romantically (though I do like Cleon...), considering they're who are on all the posters together, but to be honest, we don't get THAT much Claire and Leon content in the movie.
On the other hand, everything else, Degeneration did right. You could watch this movie without any prior knowledge of Resident Evil and be fine, and there's references to the game (RE2) to those who are long-term fans! The action scenes are thrilling, and will keep you on the edge of your seat. The plot twists/villain reveals were incredibly enjoyable and it was a bit of a shock to me! The movie ending was great, and set up the events of RE5 wonderfully (I've yet to play RE5, but I've read the story's beginning/plot. If I remembered wrong, forgive me! >_<)
Overall, Degeneration was a really enjoyable movie, and I can definitely see myself watching it again. While I do feel like Angela and Leon's brief romantic interest in each other was a waste, the movie has many, MANY more moments that are incredibly enjoyable. If you can, watch it!