I had the older game and was at level 10 with only 38 Pokémon and became frustrated with how hard it was to level up. I deleted the game last year and only got back into it this year.
I started out with a new account and within less than three days I have nearly 50 Pokémon and already hit level ten.
Its much easier to level up and there are lots of new Pokémon out there that I never saw with the old game.
The game has some glitches though. Keeps losing a GPS signal right when you try to click on an animal to catch and than it disappears. Also it keeps telling me I am going too fast when I am just standing still or walk from upstairs to downstairs. I have to click the "I am a passenger" and whatever I have walked doesnt count on my miles walked. :(
Effffyouuuuu about Pokémon GO, v1.33.1