In going back to look at the highlights:
-the first goal was a deflection in front. He was outside of the blue paint challenging the shot but just got beat by a great tip.
-the second goal was just terrible defence. Brodie left his feet and Spezza walked around him. Without any pressure from the defence on Spezza, Ramo had to play him as a shooter. When the pass went across the front of the net, Ramo did what he could from his position to take away the bottom of the net, but Michalek found a hole. In the end, when you allow an outnumbered situation down-low, you expect the goalie to take away shot and the defencemen to take away the pass.
-on the third goal, Turris was allowed to walk down the slot and pick his spot with a perfect shot.
-on the fourth goal, Ramo was definitely to blame for the giveaway, but the shot itself went off the bottom of a Flame stick, causing it to bounce hard off the ice and then equally hard back up again. That's an extremely awkward puck to track.
-on the fifth goal, the Sens made another lateral pass to a deflection in front of the net. Ramo did his best, but that's one of those where if your defence allows that play to happen, it's on them.
In the end, we need to think about what exactly defines bad goaltending. I don't think you can ever put a number on it, because a goalie who lets in 8 goals because his defence allows 40 breakaways in a game is not necessarily worse than a goalie who lets in 2 goals while only taking unscreened shots from the perimeter.
What defines bad goaltending to me is letting in goals that you expect your goalie to save. Even if you play good defence, you expect to allow the opposition to get shots during a game, but those kind of shots you expect your goalie to save, and Ramo has been doing that consistently in recent games. When your defence makes an error and it leads to a prime scoring opportunity, you hope that your goalie can bail you out. Failure to do so is not a sign of bad goaltending, but an NHL goalie is certainly expected to do it from time to time or else be replaced by someone who can. In recent games, and including the Ottawa game, Ramo has made great saves to bail out his team in addition to making all of the saves he's expected to make. That isn't bad at all, let alone terrible.