For me, In all 3 TW, Medieval is the most interesting period. Shogun has great atmosphere but lacks a bit of variety. Rome has so much nice features but seems like one power nation vs all others (idea). So, I'm happy with M2TW.

As for CA, I think M2TW is a good move. MTW seems to have drawn the most gamers (most STW owners move on to MTW and many RTW owners go back in time for MTW). MTW is something that CA has done before and could have done it better if given the chance. With lesson learned from RTW (in many aspects), CA could make M2TW the best of the best.