At the moment, GT is very flawed, but an average season for me so far.
Plot (so far):
It started off okay with Drum and Amane's first showdown and Drum joining Victories, the arc with Fumiya was fun. But then after that, it became a bit predictable with the tournament arc, which had cool battles but little to no progression for the characters or plot (except Fumiya, who is awesome).
I didn't like the Heavens Castle arc that much (even though I liked the character Pot), I wasn't a huge fan of the Delta vs Blind battle and the Aiga tournament arc was meh, though there were a couple of decent episodes. It was kinda boring IMO.
Things became interesting again with Arthur and Gwynn's introduction, I thought they were really cool characters who stirred up the plot though there were predictable episodes too but it seems things will be more interesting hopefully.
Characters:
I wasn't too big on the characters. They weren't bad (well, most of them anyway) but they never stuck out as much as I would've liked them to.
You all know I really like Fumiya, he's my favourite character in GT. I also like Pot, Arthur and Gwynn.
Drum started off kind of annoying at first, with his constant Gold Turbo squealing and his really blatantly obvious role as TT's advertising boy (more so than any protagonists in a toy-based anime), but he became okay after Arthur's introduction.
Delta's alright, I didn't like him that much at first as he felt like the generic stoic rival but I've grown on him later on.
Amane's also a mixed bag. He's likeable and has a cool personality but he suffers the same issues I have with Ranjiro. He's used solely as the seasons punching bag and never gets noticeably stronger. The only strong blader he's defeated was Drum (back when Drum was more of a rookie) but everyone else, he was easily beaten by them. Yeah, I know they need a test dummy to advertise new beys but it sucks that he has no purpose or development outside of that.
Ichika is a decent character, with her interactions with Fumiya.
And I don't have to give my thoughts on Takane, other than he sucks, I find him irritating, his voice is grating and a really poor attempt at being hip with kids. He's also a stereotypical mini-moe character, characters I don't like in general, but he is the worst of the mini-moe characters by far. He's also my least favourite character in Burst.
Blind, Lodin, Joe are okay but nothing too memorable.
Now one recurring problem I have with GT's cast is throwing away characters once they've finished being advertised. Like I get that it's a toy commercial but I hate that characters get thrown to the sidelines and completely forgotten about or completely weakened. The worst case being Amane, who hasn't grown as a blader at all and is only there for advertising fodder and nothing else.
Other seasons suffer from this like Zero-G and Cho-Z/Turbo but GT is the worst in this area.
If I had to rank the seasons (best to worst):
Beyblade G-Revolution
Beyblade Metal Masters
Beyblade (2000)
Beyblade Metal Fusion
Beyblade Burst God
Beyblade Burst
Beyblade Metal Fury
Beyblade Burst Chouzetsu
Beyblade Burst GT <---
Currently around here
Beyblade Zero-G and Beyblade V-Force (tied)
Had Arthur and Gwynn's arc not started, GT would rank at the very bottom.
Eh, I will think of something to put here...
... later ;)