Can be I guess.  Any build can be viable if you build it correctly. 

Not played a Juggernaut much and when I did I was more fire based than physical.  Defense is a strong mastery though so should be good.

Been a while since I played any Juggernaut and never as a physical one particularly.

1) No idea.

2) I always prefer Volcanic Orb over Eruption, but that's just because VO has a shorter cooldown. 

3) Again no idea.  You can if you want to and have the points for it.

4) Never really used batter myself.

5) Adrenaline yes I use that, Rally no, again because of the long cooldown. 

This is an old Irma2 build, but might still give you some guidance.

Juggernaut - http://www.titancalc.com/TitanCalc.asp?mastery=Juggernaut&master1=1&master2=5&sa=21&m1=32-12-0-8-1-0-1-1-16-0-1-8-0-0-1-1-0-12-1-8-0-0&m2=32-8-1-0-6-1-1-8-6-6-6-1-6-0-6-8-2-6-12-1-6-0-0
As with all Earth physical damage builds, only max out Earth Enchantment if you use VO or Eruption quite a bit and feel that you want the extra Fire damage. You can leave EE at 1 if you’re not using spells a lot.

Taken from this thread.

https://titanquestfans.net/index.php?topic=679.0

Console versions do have some problems from what I've read.  Some achievements not possible to get for example. 

Welcome back. 

Titan Quest 2 is in early access; was released for that back in August.  Aim atm is for full release late this year, but of course that may change depending on how development goes.  Devs are doing fairly regular blogs and also listening to the feedback they're getting via the survey forms players can fill in, Steam forums and the official TQ discord.  We're keeping track of stuff here.

https://titanquestfans.net/index.php?board=305.0

Atm it's looking pretty good. 

New content coming confirmed.

v1.1 free content/feature update and DLC #1 coming soon.
v1.2 free content/feature update coming later this year.
Large expansion later this year or early next.

https://steamcommunity.com/app/1044720/discussions/0/688620866096865959/?tscn=1768451654