You absolutely hit the sweet spot, Bungie. You know the saying: "Never touch a running system!".
Only make changes to the map pool, but keep the Reward system and Matchmaking how it is!
Edit: For those saying the Matchmaking still need some fixes, it does not. Look at it from a developers view. If the matchmaking would place you always on absolute equal opponents in team size and skill level, the matchmaking would take much longer. Also, you would get your grind done way faster than it should be. After all, Trials is still meant to be a high-endgame-activity. If you would have always super easy games, the grind would become obsolete quickly and Trials would be back at dying out because of boredom.
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Once they implement Freelance in October, then it'll be perfect. For now, it's passable.