There's an unfortunate streak of elitism amongst people that rail against the use of mechjeb/mods and/or use only stock components. I suppose it can't be helped, you're going to see that with any game and those types of people and their arrogant mentalities are just poison to the community (and new players) since as as far as they're concerned: "If you don't play like us you only have your inferior skills to blame, because obviously you would if you could." Personally, I found mechjeb really useful as a tool for teaching me how to fly better, rather than try to fumble my way through and just end up frustrated. The more practice I had with playing the game, watching what the computer was doing, and performing flights, I started using the automatic functions less to the point now that I've come to use it for the information displays (not to mention flying better by hand and eye better than the computer's ability.)