So we got two last night in Lesnar/Taker and Rollins/Cena. This seems to be all that WWE has thesedays. Going back the last few years its been screwy finish galore:
Battleground - Lesnar v Rollins - Taker attacks Brock
MITB - Rollins v Ambrose - clean finish
Elimination Chamber - Rollins v Ambrose - DQ finsh
Payback - Rollins v Reigns v Ambrose v Orton - Kane interferes
Extreme Rules - Rollins v Orton - No RKO rule and Kane interferance
WrestleMania - Lesnar v Reigns - Rollins cash in
Fastlane - Bryan v Reigns - clean finish
Royal Rumble - 30 Man RR
TLC - Bray v Ambrose - Ambrose blows himself up with a monitor
Survivor Series - Team Cena v Team Authority - Sting interferance
Hell In A Cell - Rollins v Ambrose - Bray attacks Ambrose via hologram
Night of Champions - Brock v Cena - Rollins attacks Cena
Summerslam - Brock v Cena - clean finish
Battleground - Kane v Orton v Reigns v Cena - clean finish
Before that RR to MITB are all multi-man main events other than Bryan v Kane and Bryan v Orton v Batista which are clean finishes.
Before that we got:
TLC - Orton v Cena - clean finish
Survivor Series - Orton V Big Show - HHH, Kane and Steph interferance
Hell In A Cell - Orton v Bryan - Michaels interferes
Battleground - Orton v Bryan - Big Shows knocks everyone out
Night of Champions - Orton v Bryan - clean finish but then result was revoked next night
Summerslam - Cena v Bryan - clean finish, Orton cash in - also Brock v Punk which had Haymon interferance
MITB - MITB - Haymon interferes
Payback - Cena v Ryback - clean finish
Extreme Rules - Brock v HHH - Haymon interferes
Wrestlemania - Rock v Cena - clean finish
Elimination Chamber - Punk v Rock - clean finish
Royal Rumble - Punk v Rock - Match restarted
So from 33 main events (I aint included the sub-mains) there have been 15 clean finishes, two of which are royal rumbles and two of which were ladder/MITB matches.
Pretty poor form for 2 and a half years of PPVs.