I choose Gandalf/Dwarf to try them and for the shadow as i got nertea (helps swarms, and can take back insurgent, as only 2 are too low imho).
What i found:
1) Without good pulls the fp really struggle, especially vs tracker, who stomp them easily.
2) The shadow has some swarm potential, but if you don't pull it off, you do much like nothing to the other fp and they just run
3) this shadow need many minion to swarm so bigger deck (found myself many times decked out and short of minion with 38/38), but bigger deck lead to less chances to get your fp condition/possession out as you don't have 4x, but at most 2x (leaving out boosters).
4) shadow draw/potential reside principally to insurgent, and i think this deck need a 3th copy as 2 in a big deck may lead to never draw him (happened four times)
That sayd i found out that the three starters are:
- gand-dwarf/swarm - has potential but you really struggle to pull it off
- three hunter/tracker - solid fp (nearly un-swarmable, got direct dmg, heal and fighting), probably the strongest shadow in s1 (as you can throw minion to stop and you just need a couple condition or event to get a stop; many times minions are enough)
- rohan/archer - decent fp, with fight/heal capacity (but no anti-swarm, direct dmg), shadow just throw out arrow and possibly even swarm (imho the shadow that can grow better with boosters, as many c/u greatly help this one)