Give them reasons why they're wrong. They thought it was all around the best Halo. Campaign, and multiplayer.
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It's good in the fact that there is a ton of content. It's got a decent sized campaign, lots of firefight, custom games, great forge and plenty of multiplayer playlists. The real problem is the quality. Terribly slow kill times, terrible maps, boring campaign, repetitive forge world. It's not a bad game, and I can see why some might like it but other Halos have better stories and mechanics.