I like the following features of MGT:
1) SRD. This means that licensing is easier and more straightforward; this also gives some hope for this edition becoming popular due to being adaptable to multiple settings. It also means that we could legally include some of the official rules in fan or 3rd party publications.
2) Possible popularity, especially among players new to Traveller. Mongoose will, among other things, be advertising this game outside of the current Traveller circles. If MGT will succeed, our community will get new blood.
3) The two bogymen of the playtest drafts - Timing/effect dice and power-point micromanagement - have been removed from the final product due to playtester pressure. These two features had me worried about the playability of the (unmodded) final product. Also, it is reassuring to see that Mongoose has listened to its playtesters, even at the cost of getting rid of two concepts the developers were quite in love with. Hopefully this will mean that MGT would have better quality control (i.e. less errata) than some previous Traveller products, especially T4. If only they could fix the deck-plans in time...