depends on the group, and the healer really.
i was running heroic bot yesterday for the daily heroic. my first healer was HORRIBLE. the mechanical bots (cant remember their name) were hitting hard, and he'd let me get right to 1k or so before FINALLY healing me to around 2-3k, and kept doing it. was ticking me off- flirting with danger there bud...
healer left along with 1 dps right before the first boss- the boss actually came out and walked around (never done this before) in the middle of us engaging a group. we didn't do so hot... lol
after the healer and dps left, we got another dps and an amazing healer. we proceeded to breeze through the instance, not wiping once. they let me AOE tank, and sheep'd when we thought it would be a huge pull. it was a lot of fun. so it really just depends on the group and the healer how easy/hard an instance is going to be
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