I agree and they do sound kind of out of their element on this. I hear the idea and potential for a lot of the songs but the synths, instrumentation, and mastering aren't executed correctly and it results in a bland and underwhelming album.
I'm all for artists trying new sounds, but it's crucial for them to realize when they didn't really work and why. I like Currents and it has some good moments, but it's a disappointment and hopefully Tame Impala will come with something stronger next time.
On a sidenote, Pond's "Man It Feels Like Space Again" sounds like more of a followup to Lonerism than Currents does to me. It's not as good, but check it out if you're not feeling Currents.