So far, I can only report on the playtest ( ran three seasons of Encounters using the playtest rules), and one hopes the issues with each packet have been neatly cleaned up:
Cult of Chaos: Started at level 1. Martial characters (well fighters) were pretty awesome, massively overkilling the fragile monsters, though less awesome than the Barbarian doing so with Advantage all the time. Rogues, not so much - one died instantly (like 1st round of the 1st combat of the 1st session), but the other got the Chaos Blade and after that did pretty darn well. Caster's prettymuch drooled, one Cleric played like a healbot, if there was a wizard, it did nothing memorable.
Crystal Staff: Started at level 6. Total caster dominance. Combats lasted a round or two, decided by spellcasting. Only combat that was a challenge involved an enemy wizard. No PC deaths.
Baldur's Gate: Level 1-3. Prettymuch a fiasco. Multiple character deaths, one TPK. Effectiveness was prettymuch all on the players. The wizard did put in a good showing, mainly because his player stuck it out and had a clue what was going on most of the time.