Can’t comment on air/naval maps as I don’t play those yet. Ground maps do need some improvement though, especially at higher tiers.
Something gaijin should consider is adding some AI elements to larger maps and possibly some team focused mini-objectives until the pvp action begins. The addition of these features might eliminate the potential for “boredom” I’ve seen mentioned in the comments about the problem with large scale maps. It won’t be just driving until the battle with actual players begins.
So many options could be added regarding AI elements that could add value to the addition of large maps. Interception of advanced AI scouting units, capturing AI defended bridges, capturing AI defended fuel and ammo depots, destroying retreating AI forces, the lists goes on.
For myself maps are a key element of WT and playing the same maps over and over again lends itself to boredom even with a new shiny tank/IFV/SPG or SPAA. Would love to see gaijin give a little more effort in creating larger and better designed maps but then again we can’t purchase maps, just vehicles so there you have it.
Happy hunting.