I'd like to put forth some ideas in defence of ACE HIGH's quote.
There's a common meme that mastery of any complex subject (computer programming, lawn tennis, playing a violin, anything), takes in the order of 10000 hours. That's 5 years at 40 hours a week, with no holidays or distractions. I would be very surprised if anyone on this forum has spent this amount of time welding. At 5 m/min, it sums up to 47 tons of 0.8 wire, over three thousand 15 kg rolls!
Everyone would agree that the MIG/MAG process is the easiest to get started with, and probably easiest to get reasonably competent, but who knows about mastery, other than people who have become masters of different welding processes?