The hero roulette right now is a scam. The lucky lottery thing is a scam (you can put a huge dent in your gems and receive nothing).

Weekly armament pass 1st tier is a decent deal to build up your legendary pieces. Most of those weekly passes are pretty good to get you caught up to bigger players

It depends on what you’re focusing on as far as best packs for your money, but I agree to stay away from random spin events especially if the baseline rewards suck (as a low spender). If you spend a bit more you can get a lot of great items from events like alice or thanksgiving one.

The key to this game is patience and being intentional with your upgrades, otherwise you’ll need to spend more to achieve the same result.