The Ent-A took a fair beating in TUC.
VOY was beyond a joke. AT best it paid lip service to damage at worst it totally ignored credability that it would look brand new every week withou access to starfleet spares and spacedocks.
The Ent-D got taken out by a Klingon bird of prey, even without shields a volley of torpedeos and phaser fire should have taken the BoP out.
The NX Enterprise did manage to keep going despite extensive damage during S3, but somewhat realastically it's fighting ability decressed the more damage it took
as the the JJ Enterprise a little too early to say.
The Ent-E managed to do well against the Scimitar in NEM
Th Defiant could take a fair beating, but that was down in part to it's ablative armour.
in my opinion the defiant was the least defensive ship in the TNG era it lacked shield and hull strength compared to the others even with ablative hull armor.
the Ent-D is solid but not as bulky as Voyager or Enterprise-E.
as for your Voy criticism, we have seen many ships suffer heavy hull damage or system damage and get repaired in the same episode without access to starbase like Ent-E in insurrection,the Defiant in many episode,the NX also why would voy be any different or a joke ?? with replicators and the crew working around the clock they could easily repair any interior or exterior damage.