I've enjoyed coming in late to a game, it's great fun. It forces you to think outside the box and find a niche you might otherwise ignore. For example I am in Romania with 250+ aircrafts and 8 bases, most of the aircraft are Metro's but hey it's great fun. You can have great fun playing with the standard set of planes, but challenging yourself to a niche and limiting yourself is in many ways more fun and a great learning experience to boot.
I'm toying with METROs in current GW3. They are absolutely funny & powerful. If you have an opponent with a lot of flights under 300NM with bigger planes, with patience, you're gonna make him suffer a lot.
Of course, don't expect big income... but it's absolutely fun. As I've got money to waste, I've even made a Nice-Bobo Dioulasso flight, in Metro, with a tech stop in the middle of the Algerian Desert. In 2020. Not much passengers(8 per day at 67 route image and standard price), but it's absolutely cool.