Well, each to their own, but as well as collecting content, modifying routes, and trying to learn Blender, I like to drive now and again, just for the fun of it.
This is where Railworks (and to some extent MSTS) is way above Trainz. I will be 202 before I complete all the activities in Railworks. Where are they in Trainz? In TS2010 the ECML route had 1 ONE session, in TS12 it has THREE. This may just keep me entertained for an afternoon. And the situation is unlikely to improve judging by the response to the recent session building competition.
In fact the nearest thing in Trainz I have come across, is the fantastic Razorback Railway, sadly at present stuck in TRS2004.
Trainz is great, but please do not knock the other sims when they have so much to offer some of us.
Geoff