I have this problem as well, and I don't believe this was the behavior of the previous version of the plugin. Simply a "like" is not a valuable enough commentary to post; it looks really spammy on my business's posts. :(
If some users do enjoy the "Like" as comment feature, it would be fantastic to have an option to disable these and to only have full comments appear from FB.
For what it's worth, it would be similarly awesome to have the ability to disable Twitter retweets, and to only have @-replies from Twitter displayed. That would be a way to hone down to only the truly relevant follow-up, at least for the way my site's audience works.