Ditto on the review of the Hyatt! Plus they charged quite a bit for nightly parking (which we didn't know ahead of time). Now there may be some good rooms at that hotel, but we sure didn't get one - it certainly wasn't the Hyatt quality I expect.
Our other priceline experience was before our 2005
DCL cruise to Mexico, and we ended up at the Hilton Suites (one freeway exit south on I-5 of DL)- not the Hilton across from the convention center. Our request was for a non-smoking room. Technically, it was non-smoking, but it reeked of smoke. The bedroom window was just above the outdoor smoking area, and even the bed linen smelled like it had been washed with the linen from the smoking rooms. The room layout was great, the people working the front desk were exceptional...it was just the room smell we didn't like (and the hotel was full, so there was no where we could move to).
For a hotel I had to stay at more than one night, I don't know if I would risk Priceline again.
I'll ask my DH about the Fullerton Marriott. He's been to Fullerton a few times for work (the town is literally down the street from DL). He might have stayed at that hotel.
Edit to add - yes, DH stayed there a few times. It is a pleasant hotel, nothing particularly special, but clean and comfortable - he'd stay there again.