Everyone is different - for some, the carbs in cereal just don't fit into their plan, or may be a trigger food. For some, like me, cereal makes me dump worse than anything else so I avoid it like the plague. If you don't suffer any ill effects and can fit the carbs into your plan, I think a whole grain cereal is fine - especially the ones higher in protein. If your plan says it's ok - seems like you should enjoy!
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I have cereal most mornings; however, I use just enough milk to wet it. If you're gulping down leftover milk at the end you're kind of violating the rule against drinking with your meal. Otherwise, a nice whole grain cereal full of protein and fiber can be a great way to start your day.
Only ice cream is worse than cereal for me - makes me soooo ill, even now! I have tried everything from steel cut oats to weetabix to honey nut cheerios and the result is always one (or all) of the following - major dumping/carb coma/diahhrea!
If it works for you, and you are not drowning it in milk, then I'd say go for it as an occasional breakfast.
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