Considering that the sole person actively working on SuperMechs at this given time is Alexander, he's doing great.
As for the "dull" rewards and "meta" mechs:
The rewards for quests/portals have gone up, we now have 100%/200%/300% Arena gold as well.
The meta part is up to you, honestly, nobody is forcing you to run a META mech, take @Lord Gorgon, for example, he's always tinkering mechs out of the meta, and several people are copying them notbecause they're good per say, but they're fun.
Conclusion: give the game some time, nothing is instant.