No, its not good start, and it honestly doesn't get good, imo, till about halfway through season 1 (there are 2 seasons 26 eps in season 1, 13 in season 2). As someone that just watched through all this:
1. April and Splinter are probably the best, or at least most interesting, versions of themselves... once given a chance to be characters. Splinter is... its gonna be awhile before he gets that chance, and he's gonna be AWFUL til then.
2. Rise's lore... once it actually gets going.., is actually VERY good. But again... it takes while before it does so, and until then you mostly get MOTW plots that will be very hit or miss.
3. No, that theme song doesn't really grow on you, it never really did with me.
All I can say is... Stick with it, it will most likely eventually win you over; most I talk to that like it, tended not be fans until bothers really telling its story.