Whee's this womp-rat? Only kidding. I think it had a fairly slow pace at first but there's quite a bit of world building, character introduction and place holding going on in season 1 but it does pick up, especially with the finale. Won't spoil it but will say seeing an IG assassin droid giving it loads on a speeder bike, worth watching just for that imo. I'd also say this was the first live action TV show so I'd say you can see places where they're finding their feet a bit, as well as developing the special effects.
Season 2 is a level above. True cinematic quality in every aspect and it feels like every episode is absoloutely packed with narrative, character and action. I'm of the age that the original's were my introduction and this really does get the feel of those movies, as well as loads of nods to existing Star Wars canon. I have to admit to being a big fan of Rebels and personally thought that was the best Star Wars stuff that had been done since Disney bought Lucasfilm with Rogue One a close second. The Mandalorian is easily up there with them imo.