Laguna is a track I can not see myself being fast at. The hill crest for example, you can easily get ass packed in there. You come to T1 so quickly that it gives you ass pucker moment. If you don't have a quiet exhaust, your drive out of 5 is killed by upshift ting or rolling of the throttle. The last turn before the front straight is so iffin slow that you hit it just a tad faster, your gone, bye bye. I didn't like the flow of it. Could be just me, but I just didn't enjoy it.
I absolutely hated sonoma last year, but when I got my suspension dialed in and got the lines down, I was running among the front of A/B group. The only difficulty I have with sonoma is the line through the carousel and that is just me. I need to work on hitting the right line at the right speed. I never felt danger riding Sonoma. Now don't get me wrong, you can easily crash in Sonoma, Thill, Laguna ...
Thunderhill is by far is the best of the three. Fast paced, easy to understand, ample run off, sufficient technicality to appeal to a wide range of riders... least that's how I feel.
I too feel very safe at Thunderhill, that place really gives me a piece of mind and I enjoy it thoroughly. It is kind of a benchmark track around here, where you know if that if you're under 2 minute mark, you're hauling the mail. It's definitely one of my favorites.
Sears I've ridden countless times and I will continue to. I've raced in AFM there and managed some semi-decent lap times and results. It's definitely very technical with a ton of gotchas. If you're fast there, you're fast!
As for Laguna, now I understand your reaction toward it. Ask anyone, pro racer or not, it takes some balls to take T1 right. Everyone is scared of it to various degrees. It's completely blind and if you're not confident, people flying past you will make you feel very uncomfortable. The key there is to take the right line and not chop the throttle. A slight roll-off to keep the front loaded over the crest and roll-back on for a split second before the heavy braking into T2. I'm still pretty intimidated to take the corner at the right speed and I've spent the whole weekend slowly pushing my comfort level out lap by lap. There's a lot of time to be found there.
The loud exhaust is pretty much a show killer for me and if I have no option to meet the sound level, I won't ride there period. I've ridden a few days where I had to granny it past the sound booth and I will never do that again. It screws up the entire rhythm and creates a bit of a risk zone come T6 since people behind could be closing up at much higher speed. That's why I've gone out of my way to have an optional full stock exhaust with an insert and not have a care in the world about the noise. It makes a huge difference with respect to the fun factor.