re: Is Rainbow Six Siege still worth it?

Here's the problem the OP will face.

1: the learning curve. The operators all have unique skills. But understanding how to use those skills to your advantage can be hard to learn. Also it can be difficult to adjust to the slower pace. You run and gun and you will die. Learning the sight lines can also be difficult.

2: if you don't know people who have the game it can be hard to break in with a good squad. We have a few people here that play pretty regularly and the lineups are set.

TLDR: Steep learning curve and not having a consistent crew can make this game painful to learn.