Quite a big question.
The first thing we need to do is clarify that the few that are interested in strength are NOT in the majority of fitness centers people go to. In our town, there are, I don't kno, maybe 15-20 gyms within a certain area. 2, maybe 3 of those have any people training for strength.
We keep associating the modern fitness center with what we thought gyms were back in the 60's, 70's and 80's. Back then, bodybuilders, powerlifters, and other freaks of nature were quite common in gyms. Then people realized that the best way to make money is to get a bunch of people who would like to look better to half-ass train a few days a year yet pay for full year memberships. This is good business, but provided a complete watering-down of talent in gyms.
Now the only places you will typically find strength is in locally-owned gym rat kind of places and private facilities. It's like pulling teeth to even find a place that will let you deadlift.
With that being said, what most people will see with regards to strength is a complete misrepresentation of what is achievable for a lot of men. I can easily see how people would think the average guy will never bench 275+ drug-free, but this is not the case if one is training for strength.
And here is what I'll allow as far as bench performance:
1) No pause.
2) Little perceptible bounce.
3) Ass can come up a tiny bit, but should be difficult to even see it move. If it leaves the bench before the bar does, then it's going to be too much.
4) No hands on the bar besides the lifter's after the hand-off and before the rack.
5) No double pumping.
6) Fairly even extension.
This is a gym lift, not a meet lift. I don't think we should factor in a pause, because that is too much of a judgement call. I'm sure some people think they're pausing for 2+ seconds when in reality they are counting the time the bar sunk into their gut, so lets just avoid making that judgement call here. As long as there is no significant bounce, it's fine by me.
I have seen very few guys weighing 185+ that I don't think could bench 300. Do they? Of course not, but I have seen too many guys get their bench to 300+ in a matter of months once they commit to it and stop being retarded about their training. Some guys will have a much harder time than others, but it's likely that they would have an easier time deadlifting or with other movements. That is fine, but it is a small portion of the population.
If you're under 185 or so, 275 would be a very good goal for most. Now if you're in some very low percentile of weight, like significantly under 150, you will have different goals, such as double bodyweight that you will do better shooting for.
What we see in gyms is a lot lower than what people are capable of. I would agree that most "average" fitness center guys can probably do 225-275 with their current method of training. I think they all could do a whole lot more though.