Yeah, I don't disagree. Especially with mods like yet another mech lab. I've just been a mechwarrior fan for a VERY long time and want more but it seems development is coming to an end.I usually start over after the 4th succession war.
Building your company is where the fun is for me, and the variety of mechs makes each career new and different.
I remember defending an ice asteroid (IIRC being moved to a world in need of water) from attack in mech 2 mercs. Plus going behind enemy line to steal a Kodiak. Mech 5 is missing that kind of variety.