That one incident aside, however he has the win over Cena which is an accomplishment in itself. But he's protected as shit.
Okay, main roster televised matches only. No houseshow matches, no dark matches, no matches on Main Event or Superstars since Wyatt's debut:
2013
SummerSlam: Ring of Fire match, Bray Wyatt d. Kane
8/19/13 Raw: Wyatt d. R-Truth
9/9/13 Raw: Wyatt d. Ziggler
9/24/13 SmackDown: Wyatt d. Ryder
Battleground: Wyatt d. Kingston
8/10/13 SmackDown: Wyatt d. Del Rio (count out)
11/18/13 Raw: Punk, Rhodes, Bryan, Goldust, Usos d. Shield & Wyatts
11/25/13 Raw: Punk & Bryan d. Wyatts
11/26/13 Smackdown: Punk, Rhodes, Goldust, Mysterio, Usos d. Shield & Wyatts
TLC: Wyatts d. Daniel Bryan
12/17/13 Raw: Wyatts d. Rhodes, Goldust, Bryan
12/30/13 Raw: Bryan d. Wyatt (DQ)
A bunch of random wins, and you could say he won the feud against Kane because he won the Ring of Fire match. The feud with Daniel Bryan starts in November.
Feuds won: vs. Kane
2014
1/13/14 Raw: Cage match: The Usos d. Bray Wyatt and Daniel Bryan
Royal Rumble: Bray Wyatt d. Daniel Bryan
2/3/14 Raw: Wyatts d. Ziggler, R-Truth, Xavier Woods
2/4/14 SmackDown: Wyatt d. Goldust
2/10/14 Raw: Wyatts d. Rhodes, Goldust, Mysterio
2/17/14 Raw: Wyatts. d. Los Matadores & Sin Cara
2/18/14 SmackDown: Wyatts d. Rhodes, Goldust, Mysterio
Elimination Chamber: Wyatts d. Shield
2/24/14 Raw: Wyatt d. Roman Reigns (DQ)
3/3/14 Raw: Wyatts d. Shield
3/11/14 SmackDown: Wyatt d. Kingston
3/17/14 Raw: Wyatt d. Kingston
3/25/14: Wyatt d. Big Show
3/31/14: Wyatt d. R-Truth
WrestleMania XXX: John Cena d. Bray Wyatt
4/7/14 Raw: Wyatts d. Big E, Cena, Sheamus
4/21/14 Raw: Cena d. Wyatts (DQ)
4/29/14 SmackDown: Wyatts d. Sheamus & Usos
Extreme Rules: Steel cage match: Wyatt d. Cena
5/5/14 Raw: Wyatts d. Shield
5/6/14 SmackDown: Wyatts d. Cena & Usos
5/12/14 Raw: Cena & Usos d. Wyatts
5/27/14 Smackdown: Last Man Standing match: Wyatt d. Jimmy Uso
Payback: Last Man Standing match: Cena d. Wyatt
6/9/14 Raw: Ambrose, Cena, Reigns d. Wyatts
6/10/14 Smackdown: Wyatt d. Ambrose
6/16/14 Raw: Sheamus d. Wyatt
6/17/14 Smackdown: Cena, Reigns & Sheamus d. Del Rio, Wyatt, Cesaro & Orton
6/23/14 Raw: Cena, Reigns & Sheamus d. Del Rio, Wyatt, Cesaro & Orton
6/24/14 SmackDown: Sheamus d. Wyatt (DQ)
Money in the Bank: WWE World Heavyweight title ladder match: Cena d. Del Rio, Wyatt, Cesaro, Kane, Orton, Reigns & Sheamus
6/30/14: Wyatts d. Sheamus & Usos
Battleground: Jericho d. Wyatt
7/22/14: Wyatt d. R-Truth
SummerSlam: Wyatt d. Jericho
8/25/14 Raw: Cena, Mark Henry & Big Show d. Wyatts; Cena d. Wyatt (DQ)
8/26/14 SmackDown: Reigns d. Wyatt (DQ); Henry, Reigns & Big Show d. Wyatts
9/2/14 SmackDown: Jericho, Cena, Henry, Reigns & Show vs. Kane, Rollins, Wyatts (NC)
9/8/14 Raw: Steel cage match: Wyatt d. Jericho
9/15/14 Raw: Big Show d. Wyatt
9/16/14 SmackDown: Wyatts d. Los Matadores & Big Show
11/11/14: Wyatt d. Sin Cara
Survivor Series: Wyatt d. Ambrose
12/1/14 Raw: Wyatt d. R-Truth
TLC: Wyatt d. Ambrose
12/22/14 Raw: Street fight match: Wyatt d. Ambrose
12/30/14 SmackDown: Wyatt d. Rowan
1/5/15 Raw: Ambulance match: Wyatt d. Ambrose
How Wyatt fared in the Bryan feud is up to you. He won their singles match, but he didn't accomplish turning Daniel Bryan into a Wyatt. You could argue that the Wyatts beat the Shield. Wyatts crushed the Usos throughout 2014. Cena wins at 'Mania; Wyatt wins at Extreme Rules; Cena wins at Payback. Cena wins that feud. Jericho and Wyatt trade wins at Battleground and SummerSlam, and Wyatt beats Jericho in a cage match on Raw. Call that a feud won for Wyatt. Then, Wyatt vs. Ambrose starts. He beats Ambrose at Survivor Series, TLC, and on Raw. He wins the feud against Ambrose.
Feuds won: vs. Bryan, Shield, Usos, Jericho, Ambrose
Feuds lost: vs. Cena
2015
1/19/15 Raw: Wyatt d. Bryan
Royal Rumble: Wyatt did not win.
2/2/15 Raw: Wyatt d. Ziggler
2/9/15 Raw: Wyatt d. Ziggler
2/10/15 SmackDown: Wyatt d. R-Truth
2/23/15 SmackDown: Bryan, Cena, Henry & Reigns d. Wyatt, Kane, Rollins & Big Show
WrestleMania 31: Undertaker d. Wyatt
4/7/15 SmackDown: Wyatt d. Rowan
4/17/15 SmackDown: Wyatt d. R-Truth
Payback: Wyatt d. Ryback
5/18/15 Raw: Wyatt d. Ambrose
5/19/15 SmackDown: Ambrose d. Wyatt
6/1/15 Raw: Reigns d. Wyatt
6/30/15 SmackDown: Wyatt d. Ambrose
Battleground: Reigns d. Wyatt
8/3/15 Raw: Ambrose, Orton & Reigns d. Wyatt, Harper & Sheamus
8/18/15 SmackDown: Cesaro, Ambrose, Orton & Reigns d. Wyatt, Owens, Harper & Sheamus
SummerSlam: Ambrose & Reigns d. Wyatt & Harper
8/24/15 Raw: Ambrose & Reigns d. Wyatt & Harper
Night of Champions: Wyatts d. Jericho, Ambrose & Reigns
9/28/15 Raw: Wyatt vs. Reigns (double count out)
10/5/15 Raw: Amborse, Orton & Reigns d. Wyatts
10/6/15 SmackDown: Orton & Reigns d. Wyatts
10/19/15 Raw: Wyatts d. Ambrose, Reigns & Rollins (DQ)
Hell in a Cell: Hell in a Cell match: Reigns d. Wyatt
In 2015, Wyatt's lost the Undertaker and Reigns feuds.
Feuds won: none
Feuds lost: vs. Undertaker, Reigns
In the end, Wyatt's deepest feud is against R-Truth, who has been pinned by Wyatt every year since Bray's debut. He lost his feud against Cena, but everyone loses against Cena. He and the other Wyatts beat the the Shield, 2014 was in general a pretty good win/loss year for Wyatt. But the wins came with some truly stupid stuff in the Ambrose feud, and the Jericho feud was both short and fairly meaningless. The feud against the Usos isn't remarkable because they're in the context of those six-man tags on TV. So, in the highest profile instances (Undertaker, Cena, Reigns), Wyatt's lost. Maybe that's why there's a perception that he's a weak loser.