The right choice of a software to post process scanning results depends much on the scanned object and the things you need to do while post-processing.
For technical stuff (e.g a scan of a motor block) and some reverse engineering attempt where one tries to reconstruct a part with parametric CAD-like accurate curves and hard edges: MM isn't made for such stuff - you'll need to choose some construction CAD package.
For post-processing scans of organic or artistic stuff where you want repair the result or to refine this or that detail: Consider what you want to do further on. Do you want to use the object in a further virtual process (e.g. work on its texture, pose or animate it) or do you simply want to machine (print or CNC-mill) it? In first case I'd recommend a big 3D creation suite instead, while for the second aim MM provides a sophisticated set of tools. IMO this toolset provides tools for almost any job you may want to do on a scan. Well, there are limits (as reconstructing sharp edges) and an experts application maybe better/faster in its very discipline (e.g. Low poly modelling or sculpting or mesh repairing or preparing for prints) but this way you'll need to switch between apps. In MM you'll get a "Swiss Army Knife" I consider to be ideal to start a new adventure instead of loosing yourself in an overkill of features provided by costly apps. Maybe the time will come when you decide that you need further features but be sure: What you understood about 3d meshes (working with MM) can easily be transferred on other mesh based applications.
