Ignore Goss. He just said the Avenger is terrible.
Quoted for truth.
The internet can be helpful but is often awful. I suppose the diamond in the rough analogy is best applied to it and Warmachine tactica. Luckily, you know me from face to face meeting in a game store.
There is a lot BS that surrounds Cygnar from the internet and other silliness from theory-machine. Your own experience will be the best teacher.
Trenchers are not, under any circumstances, like Winter Guard. They are a reasonable speed bump but I haven't given them enough time past that. Trencher Commandos are on the eventual list for me to pick up and seem like they have potential.
pStryker is not simple. Calling pStryker simple and kinda crappy is the common refrain of inexperienced Warmachine players. Blur, Arcane Shield, his feat, Snipe, Earthquake are all awesome spells that lead to a variety of play. pStryker is a nice balanced guy that can support his army better than his more jaded counterpart eStryker can. eStryker does support his army just in a more offensive melee way. eStryker brings an incredible offence (his Overcharge ability, his feat, Positive Charge) and tends to retard the offensive melee capabilities of enemy armies (Rebuke, Deflection).
With Cygnar, I don't think the better synergies are obvious. The obvious with Cygnar is to make a gunline and die.
Cygnar is about a combined arms approach. A great melee component, a great ranged component and a great defense to cover our approach is how Cygnar shines. Neglecting any of those three components will hurt you.
While it would be fun to debunk most of what Goss said, it may be best for you to look through and hammer out a few lists. I can give you advice on them if you like. If you want to try a few out with me and proxies, feel free. Using your mercs and some of my models could work.
While I'm sure all factions say this (especially Cryx players) our faction is one that requires a lot of synergy and tricks to keep it together. We have neither the armor of Khador or the defense of the Cryx but with have the precision and speed to get the job done.
tl;dr
Make some lists, figure out some proxies and hit me up for some practice games to see what you like.