A lot of people have agreed with you that this game is unfair now. However even with money there is still a very low chance of getting those rare items, and it would take quite a bit of money to get them, so I'm not sure it's worth the money needed.
I faced you before and I haven't used any money yet. Since you were a high level you should already have quite a lot of rare items as it is. Take a look at them and start building a strong mech around them. One piece of advice I can give you is scrap the rockets and bullets. No doubt you have some rare beam top weapons, they work a lot better now. Teleports, charges and harpoons do quite a lot of damage now so are as strong as most weapons. This means you can keep your enemy close to you the whole game without being at a disadvantage.
viewtopic.php?f=406&t=26952&start=55, also this will help with the new fusion system. Once you've learned how to play the new system it is actually enjoyable

Just got to give it a chance and give the devs a chance to fix the problems that players have with this latest patch.
This game is still in beta, so there will be changes just like this one. No doubt the devs are working on fixes because you're not the only one who has shared his opinion like this.