I can't count how many complete dud main events Cena has been at the forefront of (to the point where he, a token babyface is reviled by the crowd). Unless they feed him a bona fide winner in terms of the work (Angle, Michaels) he flounders and delivers a match that is coma inducing. Even when he does have someone who is typically pretty strong in the ring (Edge) sometimes it still ends up weak.
Batista effectively won his first title opposite Triple H in a match that pretty much had the fans wanting to get up and go take an extended piss (and he's kept up that fine level of work since then).
Lashley has to have everyone fed to him to hide his deficiencies in terms of his creativity and match layouts, or there has to be a hugely scripted layout involving other people (Wrestlemania 23) to cover up for the fact that he has all the legitimate athletic ability in the world...but zero clue how to carry a strong worked match. He's basically this years version of Goldberg...except he talks like a nine year old girl...whoopee.
Someone in the WWE front office should've spotted Khali's uselessness in APW when he was busy dropping trainees on their heads and causing lawsuits. The WWE has nearly half the audience they had in their prime because they forgot to actually book main eventers in a majority of the main events. This the same reason I had to gag my way through the majority of 2006 watching a middle-aged DX bleed their decade-old shtick drier than a popcorn fart with bad jokes and VERY ho-hum wrestling for two of the most consistent workers in the company while simultaneously being treated to Cena's pathetic meanderings.
Some points I wish to disagree with you on:
I have yet to see a Cena main-event where people are uninterested and don't care. His matches are almost always hot, and there is almost always a good reception at the end of them. Whether you like it or not, Cena IS a good wrestler.
I'm not sure which Batista matches you are referring to, but his match with Triple H at Wrestlemania and his HIAC with Triple H, is probably the best work he has produced (with his WM with Undertaker being up there to). Granted, the matches were not great by any means, but they were still solid main-events.
You compared Lashley to Goldberg. Doesn't that make Lashley pretty decent then? Regardless, Lashley's improvement since his debut has been off the charts, and he's put on some decent matches. Certainly decent enough to be considered the third tier champion in the company.
As far as Khali dropping people on their hands, must I bring up Owen Hart's piledriver on Steve Austin?
And, as far as the WWE losing their audience, let's look at the WWE champions from about 2002 on shall we? Chris Jericho lost the belt at the end of 2001, we then go Triple H, Hulk Hogan (1 month), Undertaker, Rock, Brock Lesnar, Big Show (1 month), Kurt Angle, Brock Lesnar, Kurt Angle, Brock Lesnar, Eddie Guerrero...which takes us up to 2004, which is when the audience was at it's lowest point.
Now, let's look at the World Heavyweight Champion...
Triple H, Shawn Michaels (1 month), Triple H, Goldberg, Triple H, Chris Benoit, Randy Orton (1 month), Triple H, Vacant, Triple H
That's from the title's inception until Triple H dropped the belt in 2005.
Now, we've already established elsewhere that by 2004, ratings and attendance were at half of what they were in 2001. Now, who was REALLY responsible for that? Guys like Cena, Batista, and Lashley? Or guys like Jericho, Triple H, Benoit, Guerrero, and Angle?