Riviera Beach is fine for what it is - which is a clean, comfortable place for a family to sleep, convenient to attractions in both Anaheim (30 mi) and San Diego (60 mi), directly up or down I-5.
What Rivera Beach is not - it's not a self-contained resort. No on site bar or restaurant, the pool(s) is smaller than an average roadside hotel pool, there is no coordinated activities program to speak of. There's not much in the way of attractions around it, other than Doheny State Park (the beach) across the street. Basically, it's a place to sleep while commuting to the attactions in Anaheim, Newport Beach and possibly San Diego.
Best parts - high quality beds, convenience to I-5, nice natural gas grill on the patio.
Decent parts - quality of the unit itself. Better features were newer kitchen appliances and granite countertops. Furnishings were standard timeshare quality, right down to the ubiquitous glass dining room table. Worse (or lacking features) were no laundry in the unit (which I generally expect in 2 BR units), no oven (stovetop and convection microwave only), poor TVs (ancient tube TV in the living room, small (19"?) LCD in the master bedroom, no TV in the 2nd bedroom) and no included internet ($30/wk per device, gets unreasonable when everyone in the family has laptops, ipods, etc).
Worst parts - noise, noise, and noise. I can't overstress that. Units are directly (within 10') of Pacific Coast Highway (lots of traffic noise), then there is an active railroad track on the other side of that. The windows in the master bedroom (which adjoin PCH) are single pane and cheap, with no ability to abate the noise at all. They might as well be open. The single biggest upgrade the property should consider is upgrading those with a higher quality, noise abating window. You can pretty much count on a 0630 wake-up call each morning as traffic starts to pick up. Internally, it doesn't get any better. When was the last time you saw a sign in your bathroom that says "Do not use the whirlpool bath between the hours of 10 pm and 8 am?" Riviera Beach has 'em. Evidently, our upstairs neigbors didn't see it though, as the jets for their tub at midnight resembled a cattle stampede.....I'm not a light sleeper, but this property definitely has an issue with noise.
If your only needs are a few bedrooms, a comfortable bed and convenient access to the highway - you'll be fine. If you're expecting more - it's not here. Having stayed there, I get both the positive and negative reviews. Neither is wrong, and the current overall Trip Advisor rating (3 - average) is pretty accurate in my opinion.
Final comment - it is indeed rated by Interval with "Premier", their highest rating. I have no idea why......it does not compare with other Premier resorts that we have stayed at.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.