I can see why people think it's not necessary, but I'm also glad that there will be more football. I don't care if the extra matches are along the lines of Hungary v Romania, I like football and there will still be entertaining games between sides like that (although admittedly, many sides may follow the trend of playing 'boring', defensive football in order to advance to the latter stages). Either way, you're going to end up with 16 decent teams after the group stage, and it'll be great to have those 16 teams (and there are 16 teams qualifying now anyway) fight it out in knockout format.
Plus, as others have said, it means that the Home Nations and Ireland are more likely to qualify, which I'd like to see.