Good joke of Martinelli. Leaving aside that both Indurain and Armstrong never risked to be stripped of 1 (or 2) GT titles, they dominated the Tour far more than AC (only one clear TdF-victory in 2009. 2007: gift by Bruyneel and Rabo; 2010: Schleck at least equal, if not better. AC suffered at Tourmalet, and I'm not even mentioning Chain Gate).
In addition, their opponents - at least in my memory - were (for whatever reason) stronger in average than ACs (Indurain: Guys like Berzin, Jalabert, Riis, Zülle, Rominger, Dufaux, etc. Lance: Ullrich, Puerto-Basso, Zülle, Escartin, young Vinokourov (much stronger than the nowadays edition), Pre-Crash-Beloki, Pantani, etc. AC: Well, A. Schleck. Oh, and Evans, in 2007 (should we count Ricco, who was faaar ahead of AC on the Giro-climbs 2008?).
AC has yet to accomplish a grand tour like Lance did in 2004 (six stagewins?).
OK, AC won all three GTs, that's a plus. But Lance (road) and Mig (ITT) both took World Championships. Olympic Medal-wise, they are better (Mig) or equal (Lance) to AC. Lance even enjoyed decent success in one-day-races in his pre-cancer-days, something AC is completely lacking.
This being said, AC is never going to equal Merckx. Not only because he is likely to be suspended for two years - but because the cannibal just took such an awful lot of victories in classics, (Grand)-tours etc., that he is too far ahead of everybody after him...