I mean he only played with:
Terrell Owens
Jason Witten
Terry Glenn
Miles Austin
Marty B
Dez Bryant
D. Murray
Romo's had a rough career. Plenty of QB could've done what Romo's done a Dallas... see the rookie
Let's see
TO - great WR that was disruptive to the locker room and injured/useless in the only playoff game he got to play in with Dallas
Jason Witten - excellent well rounded TE
Terry Glenn - good WR in 2006 that made a huge mistake in the playoff game. Was injured in his last year of 2007 and when he had his first game action in the playoffs, was basically useless
Miles Austin - good WR, very injury prone,
Marty B - good blocking TE while in Dallas that was basically useless otherwise due to not trying with Witten ahead of him, caused a lot of turnovers for the few times he was thrown to
Dez Bryant - great but streaky WR
Murray - good RB that didn't really blow up until the Oline became great, probably the biggest factor in losing the 2014 playoff game when he made what should have been a td into a fumble.
Yeah, Romo's had some good supporting characters overall, but when you consider he's had pretty much no good defenses, mostly awful offensive lines, and awful coaches. That's not much support for the 10 years of carrying he had to do. Not like other QBs have had much more if any success with around the same level of talent, only one I can think of was Rodgers this year, who benefitted from playing against a rookie QB and the Dallas coaching staff.