i liked it, i havnt played d2 since loD early introduction of the rune words/synergies system.
but i thoroughly enjoyed it yes it has problems like anything for my self the issues where balancing at HLD, no pking and then now player base due to impending reset
Fyi i play HC so i dunno if its different on SC i got a good few months out of the game tho probably did 1 of each toon to 90 maps system was fun, the new dungeon system should be cool blah blah blah.
ive read alot of people here hate it and i honestly dont know why, at the start i think there was some server issues, but either the people complaining are on their first game and never witnessed game issues b4 or are just hardcore d2 fans who and slighted at the existence what ever the reason it dosnt mater people are entitled to thier opinions.
TL:DR give it a try, i really liked it the community is fairly nice and helping if you play hc id honestly wait for reset as i dont play any more just due to numbers being crap there for everything takes longer lvling, trading rah rah rah.
Yes you can play single player it has 'PlugY' setup so if u wanna test shhit u can do all that
Yes it has a fully codable loot filter
Yes there is maps, an altered tris/dclone
Yes apparently there is more content to come. good luck hope it helps you get a few more hours out of our beloved game