Light roast

I must admit I'm getting confused with which roast is which. The two cups I've tried this morning have both been what I believe is 160C - 5m, 190C - 4m. It's very light, smells very nice like chocolate, but with both cups I've had (grinded at 5 and then 8) they have been acidy like regular coffee, watery like regular coffee and no more taste. The last cup had a decent amount of crema, but that just goes to show that you can have crema without taste.