That's not necessarily true. You can get the best set of gear without doing dungeons or PvP at all.

Exotic armor can be bought for 42k karma a piece, for a total of 250k or so karma. Kinda expensive, but not so bad. You can also run dungeons (which really isn't that hard), or just craft/buy 'em from the TP.

Exotic weapons can be either bought/crafted or purchased with dungeon tokens. Not particularly hard if you know the dungeon you want to run, just time consuming.

Ascended Rings can be obtained through Fractals, or by doing dailies and the monthly in approximately 20 days during each month.

Ascended Amulets can be obtained via laurels.

The only thing that actually requires a real deal of effort are the legendaries, and those are completely optional.