No, he's not. Elite defenders are definitely not a dime a dozen.
Flyers have three, Couts, Foerster and Cates. All have below average speed, but elite IQ.
When Cates came back from injury, along with elite defense he was scoring at a 3rd line rate. Give him a top 6 center and the right RW and I wouldn't be surprised if he scores at a second line rate as the glue guy (does the dirty work, CYA for his linemanes, same with Foerster) on a line.
But it's a matter of balance, you want these types, you also want a Michkov, TK, Farabee, guys who score, as well as pure speed like Tippett, Frost, Poehling and in a couple years, Avon, Tuomaala and Luchanko.
Sure, ideally you want 12 Lindros (without concussions) but in the real world, you're going to build a roster with flawed players - the key is to construct a roster with balance that creates synergies between players so that lines are more than the sum of the talents of the three players.