Here's LeBron's teams going back to his first finals appearence and the help he got in the playoffs. Then that compared to the other all-time greats.
Playoff Win Shares, WS/48 (.100 is league average):
'14 Heat:
1. LeBron, 4.1, .270
2. Bosh, 2.0, .150
3. Wade, 1.4, .104
4. Allen, 1.1, .106
5. Anderson, 1.1, .184
'13 Heat
1. LeBron, 5.2, .260
2. Bosh, 2.2, .140
3. Anderson, 1.9, .309 (one of the highest ever)
4. Wade, 1.8, .108
5. Allen, 1.5, .129
'12 Heat
1. LeBron, 5.8, .284
2. Wade, 3.1, .165
3. Chalmers, 2.1, .122
4. Bosh, 1.7, .183
5. Battier, 1.5, .097
'11 Heat
1. LeBron, 3.8, .198
2. Wade, 3.7, .216
3. Bosh, 2.6, .149
4. Chalmers, 1.2, .111
5. Anthony, 0.9, .078
'10 Cavs (Lost EC SF to Boston)
1. LeBron, 2.3, .242
2. Mo Williams, 0.7, .080
3. Antwan Jamison, 0.7, .091
4. Anthony Parker, 0.6, .086
5. Varejao, 0.6, .105
'09 Cavs (Lost EC F to Orlando)
1. LeBron, 4.8, .399 (That .399 is the highest ever, btw)
2. Delonte West, 1.2, .101
3. Mo Williams, 1.2, .103
4. Varejao, 1.2, .139
5. Ilgauskas, 1.1, .131
'08 Cavs (Lost EC SF to Boston)
1. LeBron, 2.2, .187
2. Ilgauskas, 1.2, .145
3. Delonte West, 0.9, .097
4. Ben Wallace, 0.9, .143
5. Szczerbiak, 0.7, .085
'07 Cavs (Lost F to Spurs)
1. LeBron, 3.7, .200
2. Ilgauskas, 2.3, .173
3. Gibson, 1.8, .211
4. Gooden, 1.7, .137
5. Varejoa, 1.4, .152
'14 Spurs
1. Duncan, 3.0, .200 (Incredible for his age)
2. Leonard, 2.7, .183
3. Splitter, 2.5, .234
4. Ginobili, 2.1, .179
5. Diaw, 1.9, .162
'10 Lakers
1. Gasol, 4.3, .224
2. Kobe, 3.6, .190
3. Odem, 1.7, .125
4. Bynum, 1.7, .150
5. Fisher, 1.4, .087
'09 Lakers
1. Kobe, 4.7, .238
2. Gasol, 4.3, .221
3. Odem, 2.6, .173
4. Ariza, 2.2, .143
5. Fisher, 0.9, .068
'07 Spurs
1. Duncan, 3.3, .214
2. Ginobili, 2.6, .204
3. Parker, 1.6, .100
4. Finley, 1.6, .146
5. Oberto, 1.5, .168
'05 Spurs
1. Ginobili, 4.2, .260
2. DUncan, 3.5, .191
3. Horry, 2.6, .199
4. Mohammed, 1.7, .158
5. Barry, 1.2, .107
'03 Spurs
1. Duncan, 5.9, 2.79 (Highest ever total WS)
2. Robinson, 2.3, .204
3. Ginobili, 2.1, .152
4. Bowen, 1.6, .104
5. Jackson, 1.3, .077
'02 Lakers
1. Shaq, 3.8, .236
2. Kobe, 2.6, .148
3. Horry, 2.2, .153
4. Fox, 1.3, .099
5. Fisher, 1.3, .094
'01 Lakers
1. Kobe, 3.8, .260
2. Shaq, 3.7, .260
3. Fisher, 2.5, .207
4. Fox, 1.6, .132
5. Horry, 1.2, .150
'00 Lakers
1. Shaq, 4.7, .224
2. Kobe, 2.1, .115
3. Horry, 1.2, .096
4. Rice, 1.1, .067
5. Harper, 1.1, .080
'99 Spurs
1. Duncan, 3.7, .243
2. Robinson, 3.0, .243
3. Elliott, 1.9, .157
4. Johnson, 1.5, .111
5. Elie, 1.3, .118
'98 Bulls:
1. Jordan, 4.8, .265
2. Pippen, 2.9, .166
3. Kukoc, 2.4, .182
4. Rodman, 1.5, .097
5. Harper, 1.5, .126
'97 Bulls:
1. Jordan, 3.9, .235
2. Pippen, 2.3, .145
3. Harper, 2.0, .183
4. Kukoc, 1.3, .146
5. Kerr, 1.0, .144
'96 Bulls
1. Jordan, 4.7, .306
2. Pippen, 3.0, .195
3. Rodman, 1.9, .149
4. Harper, 1.8, .174
5. Kerr, 1.4, .184
'93 Bulls
1. Jordan, 4.4, .270
2. Grant, 2.4, .180
3. Armstrong, 1.8, .137
4. Pippen, 1.4, .083
5. Paxson, 1.1, .160
'92 Bulls
1. Jordan, 4.1, .216
2. Grant, 3.3, .184
3. Pippen, 3.1, .168
4. Paxson, 1.5, .123
5. Williams, 0.9, .128
'91 Bulls
1. Jordan, 4.8, .333
2. Pippen, 2.9, .197
3. Grant, 2.6, .189
4. Paxson, 1.5, .143
5. Cartwright, 1.2, .110
'88 Lakers
1. Magic, 4.0, .198
2. Worthy, 2.8, .148
3. Scott, 2.3, .125
4. Green, 1.8, .121
5. Thompson, 1.1, .086
'87 Lakers
1. Magic, 3.7, .265
2. Worthy, 2.7, .190
3. Kareem, 2.0, .171
4. Green, 1.9, .179
5. Cooper, 1.8, .165
'86 Celtics
1. Bird, 4.2, .263
2. McHale, 3.2, .215
3. Ainge, 2.7, .201
4. Johnson, 1.5, .102
5. Walton, 1.1, .175
'84 Celtics
1. Bird, 4.7, .236
2. McHale, 2.1, .142
3. Maxwell, 2.0, .126
4. Parish, 1.9, .105
5. Henderson, 1.9, .105
'81 Celtics
1. Bird, 3.1, .198
2. Maxwell, 2.5, .201
3. Parish, 1.4, .139
4. Archibald 1.3, .096
5. McHale, 1.1, .177
LeBron clearly has had much less help than these other players that you've placed ahead of him. He's also played better than most of them.