That's absolutely incorrect. There's plenty of critical pieces on DLC, the same as any full price release. Purchasing a Season Pass takes away that power to be critical and informed. How do you rationalize that?
The vast majority of gamers never read reviews for full games (beyond word of mouth), how many do you think will read reviews for DLC?
I loved DAO's dlc, I liked DA2's dlc. DAI has had 3 times as long dev time as DA2, I have little doubt that I will very much enjoy it, and I am hopeful I will love it. I almost certainly will be buying all dlc, I trust Bioware (ME3 was better than ME2 bar the last 20 seconds, and the DLC for ME3 was stellar) so I have no reason not to save money with a season pass.
As for the 'power' we have if buy dlc one-by-one, well how many people are going to buy the next Borderlands season pass if they felt they didn't get their moneys worth off this round? Its the exact same principle as a company making only a single piece of dlc for a game, if it sucks buy they got $15 a pop for it then no-one will buy the next games dlc. There is a moderate benefit to you buying the dlc one-by-one only if the dlc sucks. So by not buying the season pass you are betting the dlc is going to be lack-luster. If that is the case why would you even buy the game for full price? If you don't think the dlc will be worth it why would the game be worth 5x the price?
A $20-25 season pass for 3 pieces of real dlc and 2-3 item packs / alternate uniforms or appearances means that you are paying $15 more than the first dlc if that is all you buy. $5 if you only get 2. You saved $5 if you go for all three, and $15 if you go for the little bonuses as well. I'd love to see a statistic of how many people buy 1, 2 or all 3 DLC's, but I'm betting most people that buy 1 go for all three (leaving off the cheaper extras which I personally never go for).
If you don't want to buy a season pass feel free, but arguing against it is selfish and silly. If someone buys a season pass from some company and feels they got jipped then that is their problem. Failure is what teaches us, much more than success.