I like Pelican. I own their entire catalogue and I guess I'm a fan but I'm not in love with them. Up until city of echoes, I couldn't fault them for releasing consistently entertaining, predominantly major sludge/post-metal. City of echoes was somewhat disappointing imo. It definitely was not a total flop, but I don't know, just didn't feel that they really capitalized on its potential. I didn't hate it I liked it even but wasnt that impressed. And I kind of feel like Pelican has yet to really differentiate themselves from Isis. Every time Isis makes a stylistic choice, pelican moves in the same direction.
If you want to get into Pelican I think fire in their throats would be a good place to start, with Australasia being their best work.
Just to clarify, Australasia is an EP not a full length.
If you're into instrumental ensembles with some post-metal influences check out both Irepress and Russian Circles. Both imo are actually way more talented than Pelican but YMMV. Oh and both have new albums out soon hopefully.