First and foremost, the majority will spam disagree on this because its a good addition to the Ring of Fire pool, which was originally Nick Fury with fillers. The point of the thread is to consider an objective outlook on her impact in BGs as you'll get nukes with her, but so will your opponent (which means if you're f2p or wont spend the odin for a shot at the crystal then you're SOL)
See below for the points / counterarguments id like to make
#1 the game has shifted to champion releases which consist of 3 bars to get the nuke in BGs. For example, the classic sp1 sp2 or sp2 sp1 rotation. However, Tigra is one of those champs that will nuke plenty of matches in just a single sp2. And imagine an r4 punching down against an r3.
#2 Her skill requirement is significantly less in BGs. This reason and #3 below are likely the justifications Kabam used to proceed with her release, because "not everyone can play her". Well what if i told you im BGs with smaller health pools, her skill requirement is significantly less

This was my 1st ever tigra match from ages ago, and she completely destroyed it. Same rank champs, but tigra will even be able to punch up very well
#3 "she needs high sig" - this is one of the weakest arguments imo as it will age very poorly with time. We have an increased availability of sig stones , with them popping in SDE (and now in titan form), and theyre only going to get even more available.
#4 Her insane versatility- unlike spiral who's mainly used for serpent, idoom whos used for bishop etc, tigra works for several matchups in various classes like sentinel, thing, kindred, red skull, nick fury, and many more.
#5 Her viability - juggernaut the strongest attacker doesnt work in half of the metas since hes hindered by debuffs or anti buff metas. Tigra will work for a bunch of metas . Its a very small number of nodes that will shut her down like force of will or additional ability accuracy
If for some reason, this still hasnt convinced you yet , then this is a top BGs player (so easily more than skilled to use her outside BGs) saying the same thing. she literally took 15 defenders in 10 minutes.
https://youtu.be/cEqS1SJsDJ8?si=fbxjWpmCEVDaulTs