I haven't watched the dubbed in a very long time, but I did recently look into it as I like to periodically see where the dubbed is. If you're waiting to catch up for the dub to finish the entire series, then I can tell you that based on where it is right now it will be another 2 years exactly for the dub to finish the entire series—the dub releases a batch of 11-15 episodes every 3 months, and there's still some ground to cover, so unless they start doubling or tripling the releases (which isn't likely at all) then you're indeed looking at roughly 2 years.
In regards to your question about animation/quality overall—there are only 4 episodes specifically that blew me away in terms of animation, everything else ranged from mediocre-completely average. Around where the dubbed currently is, is where the series really started to decline in animation quality as well as integrity as they started throwing in entire filler arcs inbetween as little as 2-5 canon episodes (there was once an entire year with only 4 canon episodes released). So unless you enjoy filler as much as the canon, you're in for a rude-awakening on this one. In my honest opinion, considering how much filler there is (and the rest of the arc in general) it's not worth waiting 2 years, if you're craving to know what happens and don't want to read the manga then watch the subbed anime.