As someone who watched all seasons and spin-offs of Toaru series (AKA Raildex) I can say for sure that it has many ups and downs and by the time I'm writting this review I believe Railgun T is highest peak of Series, without being nitpicking and biased I'm going to discuss about positive and negative points of Railgun T.

Discalimer : to make the review a little more rational I'll constantly will compare RT to its predecessors RS and Index series or some other, I DO NOT mean that those animes are bad by any means.

First things first, let's talk about Characters, just like Index Series, Railgun has a lots of characters with their even far more unique personalities but unlike Index series it will not throw any of older characters to trash can and keep a focus on newer characters which eventually will have the same fate, _for ex:
Aisa Himegami is one of important, or if I can say so a popular characters which has a total useless part in seires now, and that is just because her arc is over, so is her entire roll._
but at the other hands, even far less popular and important characters in Railgun T, which you even may not recall them from previous Railguns has a decent roll in new season like Kinuho Wannai and Maaya Awatsuki. while most animes fails to deliver this level of character creation they either emphasise or totally forget side characters, but in railgun T you can still easily say who are main characters, while side characters are still getting enough attention.

Second thing second, art style of anime is a marvel in 2019/2020. okay hear me out in this one, while most animes out there even Index III or Accel hard-try their way through a wierd and bad looking 3D-esh-like art style, which make absolutely no sence AT all, or at the other hand some anime has a realy old-looking and crappy art style, railgun T is one a few animes out there which still keep the very essence of an anime and have an up-to-date visuals for a 2020/2019 anime. for EX : as someone who really love monogatari series, I have to say I never liked style of it specially kizumonogatari, it is not an anime style if you put wierd 3D and real life objectives.

Third thing third, lets talk about art of creation, to be more specific, making a good story is hard, but how to tell it is the important part. Story progress is times harder than story creation. a really good story can be unbrearable with a bad story telling and it's work the other way around too. at a first glimpse Railgun T story may sound familiar repetitive, but how they deliver it and make different events make it realy smooth. for another EX : index stories are always more complicated and have more depth to them, but the way it is told is like someone want to make people confused on purpose. while railgun take you through ride like train, slow at begining with a proper acceleration. Railgun T embrace all it can and represent them in a smooth way which you will neither get lost or confused.

Last things last, for first time in my life I'm considering fan-servis a positive point, well let's say if you are watching laid-back camp and lucky star you know you are watching best CGDCT animes out there so you expect fan-servis, but if you are watching a action an serious anime (at least for me) I like that it have a full focus on story not stupid fan-servis. but the way which railgun T using fan-servis I can say for 100% is by far the best in animes, this is some how the way which Final Fantasy 7 did it. without making it obivous it uses character cuteness to make amazing fan servis. for last EX : I watched 6 seasons of toaru series and I've never even notice Pierce Aogami but right now he is my fav male character :).

that's it, I hope this review was usefull to you.
thanks for reading