You asked specifically about disqus, and as this is somewhat subjective even for technical answers (only because some answers are of technical nature, it does not mean they are not subjective), it’s probably worth to look a bit around what others have asked and answered: What is the best method for handling comments?
You can however just opt-in with disqus. At startup, it will sync the existing comments of your blog. Then, new comments on disqus will get synched with your blog as well. So you can just try and if it pleases you and your users, you stick to it, otherwise drop it. You won’t loose any of your comments (disqus for wordpress, needs signup).
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