" If you want an inexpensive starter set that's good detail and build quality, MTH is the name of the game now that Lionel has gone to LC."
No one would argue that MTH starter sets reflect, on average, higher quality rolling stock and locomotives than, in particular, the less expensive LionChief starter sets. They also have the advantage that if you remain in the hobby, and choose to spring for $300 for DCS, they function like any other MTH PS3 loco in command mode. The only advantage in quality Lionel sets have is that Fastrack is, in my view, a superior track system for the beginner and down the road (command control switches are available, for example, which is not true of the corresponding MTH track line).
However, MTH sets are not inexpensive. A typical LionChief low end set can be had for as little as $100 or less in post-Christmas sales, and many sets are under $200 all year long. Most MTH starter sets with PS3 command locos are in the $300 and up range, so that's a substantial price differential, particularly for a new hobbyist who isn't sure what he or she will be doing in the future.
In addition, the LionChief locos from a beginner's set will operate as a command loco on any conventional or TMCC/Legacy/DCS command layout, without additional expense. No need for the $300 additional investment in DCS or Legacy. The upfront investment to control two locos independently on a loop or layout is about $200-400 with LionChief/LionChief Plus versus about $600-800 with MTH RailKing PS3 locos and starter sets. That's a major difference in cost for, in my view, a relatively modest increase in quality and functionality for the beginner.