I don't think gameplay has gone down at all. Not even since the days of AW. All types have existed at all times.
In AW in 1996 there was no kill-shooter. You could damage or even kill friendlies, but if you did it to two you were PNG'd from your country for 24 hours. To compensate, the griefers would sit at the end of the runway in vehicles pinging you on take-off until you were smoking but they wouldn't kill you.
In 1996 in AW you couldn't capture bases, but you could close them down for 15-30 minutes (memory's foggy on the exact amount of time). Essentially, toolshedders killing the furball.
In AW in 1996, you could go blow up the Spit factory, removing Spitfires from the enemy arsenal. A rudimentary, player controlled ENY (you should have heard the whines on "all channel").
In AW in 1996 bombers didn't need to be calibrated. They were always calibrated at any altitude and any speed and could drop with pinpoint accuracy eliminating the possible need to Jabo heavies.
In AW in 1996 you could man a B-17 with 6 gunners, a bombardier and the pilot, a virtually impenatrable defense (otherwise known as a "death star"). And death stars were often found breaking up furballs or defending fields (yes, the guns worked while on the runway).
In AW on AOL in 1996, there were many many players as it was a free service. There simply weren't as many in a single arena, but at the same time the maps were much much smaller and there were both full and relaxed realism Europe and Pacific theaters as well as WWI and Korea plus the DA, TA and SEA arenas (at least 9 arenas total).
In AW in 1996 people would both <S> and whine just as they do today. They would HO and vulch just as they do today. They would cherry-pick and furball just as they do today.
Nothing has changed in 12 years except the game has gotten better. The community (and the percieved splintering and/or degredation thereof) is the same.
Exploitation happens only as a result of game design and HTC has done an admirable job of closing the most onerous exploits over time.
I think the community is getting closer again. I get and give more <S>'s to opposing players now than I have at any time since I started playing AH in 2001.
12 years of enjoying these flight sims and guess what... I still enjoy it. There's many here who feel the same. Sure some have left... it's inevitable, but overall the community has grown and thats a good thing for all of us (especially HT).
Lastly, I doubt HT needs to do a poll to find out how people play the game. I'm sure he has complete usage stats on the different planes and vehicles including time per sortie, time online per user, population densities, strat/field down-times, new subsriptions, average length of subsciption and many many more stats that you and I have no clue of to help in directing the development of their business. And what exactly is this poll going to ask? Has gameplay gone downhill? Not a very subjective question to base your business on considering all the other statistics at your disposal.
[Edited for content]