Opinions don't really fuel the edition war. They never did. Now, 4E has changed a few things from previous editions, and from an opinion standpoint some people approve of the changes and some do not, but this does not cause an edition war. Differing gaming preferences and whether some people prefer World of Darkness and others prefer GURPS don't produce this sort of fight. They crux of the edition war is possession of, definition of, and membership in Dungeons and Dragons. WotC owns Dungeons and Dragons, and has released 4E, which in a de facto sense states "this is D&D". 4E is being sold in stores as D&D, is currently being printed, is getting more high profile support, and has a more active official playing community(RPGA) than earlier editions. Buying into and supporting the new edition in a de facto sense rejects earlier editions, as you are setting them aside in favor of the new. If you are of the opinion that the older version was better, on top of your opinion you have lost a lot of players(who left for the new edition), a lot of people are playing and defining D&D as something to your dislike, your game isn't being printed as D&D anymore, isn't getting new official books. In addition to your opinion, you have loss.
Now, you can continue to play the older edition you prefer, but I don't think anybody can say in a hobby-wide sense that playing 3.5E now is what playing 3.5E was before 4E. On the other side, those who prefer the new edition would like to put the old to bed and get on with their gaming future.
The fight isn't over what you prefer or even which game is better. Its about who gets to call their game D&D, and I don't believe both can have their way.