This may turn into a lively discussion but then so be it
What should we look at in terms of fat? If we subscribe into the calorie is just a calorie theory then the types of fats should be inconsequential to any sort of weight loss or gain and actually the ratios should also not matter either. If the theory is more along a high protein diet then the type of fat also shouldn't matter. But we hear about using olive oil and staying away from animal fats in cooking along with the dangers of saturated fat for weight loss/gain (not to mention heart disease).
For example - I had an avocado earlier. I'm contemplating having another - but according to ye olde fitday one avocado has 27 grams of fat. Having another will sky rocket my fat intake for the day and already it will be hard to stay under the limit (trying to stay below 65g). In terms of 'good vs bad' fat though it's much better than saying having a small steak. If I don't care about the types of food (as in a calorie is just a calorie) then I could easily have another since I'm way under my calories for the day and not really care about the ratios (of fat-carb-protein). If the ratios are important than having another would be a bad thing.