[alandarev]

Network Performance: d2.xlarge - Moderate, d2.2xlarge - High, d2.4xlarge - High.

This ambiguity alone is the reason I and probably others will look elsewhere.

[Pirate-of-SV]

If you put it like that every EC2 performance metric is ambiguous when not using dedicated instances.

[engendered]

They tell you specifically how much RAM you get, and there is no confusion. They also tell you exactly how much storage you get. In this case they very specifically tell you disk read throughput.

So there are a lot of metrics that are not ambiguous. Imagine if they told you that you get a "moderate" amount of RAM, and maybe it could be 4.5GB, or maybe it's 9GB.

There would be benefits if Amazon gave SLA style promises for these sorts of instances. When they see that they are falling short, they redistribute loads or add hardware to meet the promise. Otherwise it's generally somewhat meaningless because if you can't plan on it, you can't build a plan around it.

[makeitsuckless]

Because a) you actually want dedicated services in the first place and would not consider EC2 regardless, or b) you like being lied to?