Just try a demo, the ranger class at first impression felt very kick a$$. Maybe cause moi pray on easier difficulty, the 3 ranger melee attack that moi managed to pull off manage to crit and one hit kill all the 3 at full health targets.
Also love the sniper, now at close\mid range can get a free pistol shot before sniping can do two attack damage, so easier to kill off enemy in one round even with no crit now unlike last time sniper always can only try pick off enemy with low health but usually can't do $hit against those full health type without crit. But too bad the attack is separate action (ie free action for one pistol attack) if they combine this into one single cinematic attack will feel very kick a$$.
So far the other class not much surprise or feel rather the same as previous Xcom game. Maybe the demo still early state not yet full chance to expose such new class like the specialist hacker.
And demo fight enemy maybe ish still beh kan early level unit so their melee only does 3~4 damage non crit (but still hurt alot as your Xcom unit only like 7~8 bar nia). If end game type moi really worry the melee very OP from those late game alien will easily one hit KO most of your soldiers.
And viper si pek scary, KNN their tongue don't know how long, very far behind cover still can ganna pull one.
However still felt very heart pain to throw down the $$$ for pre-order, KNN nowadays more and more PC tri-A titles ish selling at over SGD 70.