I would have said "sure, long as you couch it friendly like" but I can see few like that, not one little bit. Online discourse has really gotten rough. I freely try to offer compliments because I know someone going "cool look!" always brightens my day, and I certainly offer help if someone's expressing trouble (I once got to explain about slotting for Stamina to a brute I was teaming with at low level who was suffering). If nothing else, you could always phrase it something like "I see you skipped Awesomeness Power, I loved that on my brute, what was your thinking behind that?" Make it more of a conversation that a one way street.