
The Dragon is a suprisingly fast mech with the right engine in it making it a good medium/light hunter, I would choose this over a Centurion since they have almost the same hardpoints. Unfortunately I find that their hardpoints are horribly placed on these mechs.
I have played a bit with Stalkers and Cataphracts and do find them to be effective but I do try to be flexible and resist boating, unless of course I have enough tonnage to boat and be flexible like my 4 PPC RS with streaks.
There are only 2 announced mechs that will not be in the game, the Flea and the Orion and I'm not sure I like them either.