La Ronde is definitely better than a lot of the other Canadian theme parks such as the PNE in Vancouver, but it pales in comparison to the theme parks that you can find in America and Asia.
I really enjoyed several of the roller coasters at La Ronde but my first experience here in the summer was horrible because it was extremely humid and the 90 minute wait for the Goliath was simply torture. Since there was a promotion going on at the time, we decided to purchase a year pass so we could go several times throughout the summer.
Our second visit was actually in the pouring rain while our third visit was probably the best because it was just cloudly. Our final visit was rainy as well but it was the most worth it because we got to share our 50% off coupons with our friends who had never gone before.
Anyways, I think La Ronde is definitely a fun theme park if you're stuck in the province of Quebec, but I would much rather go to Fuji Q Highland or Disney Sea in Japan.
Tip: Their season passes actually work at any of the Six Flag theme parks in North America!